question: Who is Cao Li's paternal grandfather?
context: [["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Cao Lin (Prince of Donghai)", ["Cao Lin( died 5 February 251) was an imperial prince of the state of Cao Wei in the Three Kingdoms period of China.", "He was a son of Cao Pi, the first Wei emperor, and the biological father of Cao Mao, the fourth Wei emperor."]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Cao Pi", ["Cao Pi  (\u2013 29 June 226), courtesy name Zihuan, was the first emperor of the state of Cao Wei in the Three Kingdoms period of China.", "He was the second son of Cao Cao, a warlord who lived in the late Eastern Han dynasty, but the eldest son among all the children born to Cao Cao by his concubine (later wife), Lady Bian.", "According to some historical records, he was often in the presence of court officials in order to gain their support.", "He was mostly in charge of defence at the start of his career.", "After the defeat of Cao Cao's rival Yuan Shao at the Battle of Guandu, he took Yuan Xi's widow, Lady Zhen, as a concubine, but in 221 Lady Zhen died and Guo N\u00fcwang became empress.", "On 25 November 220, Cao Pi forced Emperor Xian, the last ruler of the Eastern Han dynasty, to abdicate in his favour, after which on 11 December 220 he proclaimed himself emperor and established the state of Cao Wei.", "Cao Pi continued the wars against the states of Shu Han and Eastern Wu, founded by his father's rivals Liu Bei and Sun Quan respectively, but did not make significant territorial gain in the battles.", "Unlike his father, Cao Pi concentrated most of his efforts on internal administration rather than on waging wars against his rivals.", "During his reign, he formally established Chen Qun's nine-rank system as the base for civil service nomination, which drew many talents into his government.", "On the other hand, he drastically reduced the power of princes, stripping off their power to oppose him, but at the same time, rendering them unable to assist the emperor if a crisis arose within the state.", "After Cao Pi's death, his successor Cao Rui granted him the posthumous name \"Emperor Wen\" and the temple name \"Shizu\".", "Cao Pi was also an accomplished poet and scholar, just like his father Cao Cao and his younger brother Cao Zhi.", "He wrote \"Yan Ge Xing\" (\u71d5\u6b4c\u884c), the first Chinese poem in the style of seven syllables per line (\u4e03\u8a00\u8a69).", "He also wrote over a hundred articles on various subjects."]], ["Duke Gong of Cao", ["Duke Gong of Cao (? \u2013 618 BCE)  was the seventeenth ruler of the vassal State of Cao during the Chinese Spring and Autumn period (770 \u2013 475 BCE).", "Born Ji Xiang (\u59ec\u8944), he was the son of Duke Zhao of Cao.", "In 637 BCE, during the exile of Chong\u2019er, son of Duke Xian of Jin, Duke Gong heard that Chong\u2019er suffered from fused ribs and wanted to see for himself.", "Chong\u2019er caught Duke Gong spying on him whilst he bathed and described the Duke as a man of \u201cunbelievable rudeness\u201d.", "After Chong\u2019er became Duke Wen of Jin and one of the Five Hegemons, in 632 he used Duke G\u00f2ng's previous rudeness as an excuse to overthrow the State of Cao.", "Duke G\u00f2ng was captured by the State of Jin but later released.", "After Duke Gong of Cao died in 618 BCE, his son Duke Wen of Cao became ruler."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Duke Dao of Cao", ["Duke Dao of Cao( 6th century BCE) was the twenty- second ruler of the vassal State of Cao during the Chinese Spring and Autumn period( 770 \u2013 475 BCE).", "Born as J\u012b W\u016d( \u59ec\u5348), he was the son of Duke Ping of Cao from whom he inherited the throne.", "Duke Jing of Song captured D\u00e0o in 515 BCE and held him prisoner until his death.", "Thereafter, disorder broke out in the State of C\u00e1o as D\u00e0o \u2019s successors, Duke Sheng of Cao and Duke Yin of Cao, were killed one after the other."]], ["Count You of Cao", ["Count You of Cao( ?\u2013826 BCE) was the seventh ruler of the vassal State of Cao during the Chinese Western Zhou Dynasty( 1046 \u2013 770 BCE).", "Born J\u012b Ji\u0101ng( \u59ec\u7586), he was the son of Count Xiao of Cao( \u66f9\u5b5d\u4f2f) and the younger brother of Count Yi of Cao( \u66f9\u5937\u4f2f).", "Count You was killed by his younger brother Count Dai of Cao( \u66f9\u6234\u4f2f) in 826 BCE after a nine- year reign."]], ["Duke Mu of Cao", ["Duke Mu of Cao( 8th Century BCE) was the eleventh ruler of the vassal State of Cao during the Chinese Eastern Zhou Dynasty( 770 \u2013 256 BCE) and Spring and Autumn period.", "Born J\u012b W\u01d4( \u59ec\u6b66), he was the son of C\u00e1o Hu\u00ecb\u00f3( \u66f9\u60e0\u4f2f).", "In 760 BCE, Duke Mu of Cao killed his elder brother C\u00e1o F\u00e8ib\u00f3( \u66f9\u5ee2\u4f2f/ \u66f9\u5e9f\u4f2f) and appointed himself ruler of the State of Cao.", "He was the first ruler of the State of Cao to receive the posthumous title of\" Duke\"( \u516c)."]], ["Cao Li", ["Cao Li (208 \u2013 May or June 229) was a prince in the state of Cao Wei in the Three Kingdoms period of China.", "He was a son of Cao Pi, the first emperor of Wei.", "His mother, Consort Xu (\u5f90\u59ec), was a concubine of Cao Pi.", "He had two full sisters: the elder one was Princess Linfen (\u81e8\u6c7e\u516c\u4e3b) while the younger one, who was unnamed, died early.", "Cao Li was enfeoffed as the Duke of Qin (\u79e6\u516c) in 221, with his dukedom in Jingzhao Commandery (\u4eac\u5146\u90e1).", "In 222, he was elevated to the status of Prince of Jingzhao (\u4eac\u5146\u738b).", "In 225, his title was changed to Prince of Yuancheng (\u5143\u57ce\u738b).", "He died in 229 during the reign of his half-brother Cao Rui.", "In 231, Cao Rui designated Cao Ti (\u66f9\u608c), a son of Cao Kai (\u66f9\u6977) and grandson of Cao Zhang, as Cao Li's heir; Cao Ti thus became the new Prince of Yuancheng.", "In 232, Cao Ti's title was changed to Prince of Liang (\u6881\u738b).", "Throughout the reigns of the subsequent Wei emperors, the number of taxable households in Cao Ti's princedom increased until it reached 4,500."]]]
supporting_facts: [["Cao Li", 1], ["Cao Pi", 1]]
evidences: [["Cao Li", "father", "Cao Pi"], ["Cao Pi", "father", "Cao Cao"]]
answer: Cao Cao