question: Who is Hulagu Khan's paternal grandmother?
context: [["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["Hubba bint Hulail", ["Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic\" Nab\u012b\"( Prophet) Muhammad ibn Abdullah."]], ["George, son of David VII of Georgia", ["George,\" Giorgi\",( 1250 \u2013 1268) was the eldest son of David VII Ulu, a Bagratid king of Georgia, by whom he was designated as heir- apparent to the throne.", "In the early 1260s, he was held as a hostage at the Mongol Ilkhan court of Hulagu Khan and later served with his father in the Mongol military ranks.", "He died at the age of 18 in 1268, preceding his father by two years."]], ["Hulagu Khan", ["Hulagu Khan, also known as H\u00fcleg\u00fc or Hulegu (\"Hul\u00e2gu x\u00e2n\"; Arabic: \u0647\u0648\u0644\u0627\u0643\u0648 \u062e\u0627\u0646/ \u0647\u064e\u0644\u064e\u0627\u0648\u064f\u0646; ; 8 February 1265), was a Mongol ruler who conquered much of Western Asia.", "Son of Tolui and the Keraite princess Sorghaghtani Beki, he was a grandson of Genghis Khan and brother of Ariq B\u00f6ke, M\u00f6ngke Khan, and Kublai Khan.", "Hulagu's army greatly expanded the southwestern portion of the Mongol Empire, founding the Ilkhanate of Persia, a precursor to the eventual Safavid dynasty, and then the modern state of Iran.", "Under Hulagu's leadership, the siege of Baghdad (1258) destroyed Baghdad's standing in the Islamic world and weakened Damascus, causing a shift of Islamic influence to the Mamluk Sultanate in Cairo and ended the Abbasid Dynasty."]], ["Mona Hopton Bell", ["Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.", "She was the grandmother of the painter Jean H. Bell."]], ["Diana Guardato", ["Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos", "I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others."]], ["Anne Denman", ["Anne Denman( 1587\u20131661) was born in Olde Hall, Retford, Nottinghamshire.", "Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne."]], ["Tjuyu", ["Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.", "She is the grandmother of Akhenaten, and great grandmother of Tutankhamun."]], ["Tolui", ["Tolui, (Classic Mongolian:", "Toluy, Tului, , , Tolui Khan (meaning the Khan Tolui))", "(c.1191\u20131232) was the fourth son of Genghis Khan by his chief khatun B\u00f6rte.", "His \"ulus\", or territorial inheritance, at his father's death in 1227 was the homelands in Mongolia, and it was he who served as civil administrator until 1229, the time it took to confirm \u00d6gedei as second Great Khan of the Mongol Empire (1206\u20131368).", "Before that he had served with distinction in the campaigns against the Jin dynasty, the Western Xia and the Khwarezmid Empire, where he was instrumental in the capture and massacre at Merv and Nishapur.", "He is a direct ancestor of most of the Ilkhanids.", "Tolui never used the title of Khagan himself; neither Genghis Khan nor his immediate three successors would ever use any reigning titles unlike the neighboring Chinese dynasties in the south.", "Tolui was awarded the title of Khagan by his son M\u00f6ngke and was given a temple name (Chinese: \u5143\u777f\u5b97; pinyin: Yu\u00e1n Ru\u00ecz\u014dng; Wade\u2013", "Giles: Jui-Tsung) by his other son Kublai, when he established the Yuan dynasty a few decades later."]], ["Kaoru Hatoyama", ["After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama."]]]
supporting_facts: [["Hulagu Khan", 1], ["Tolui", 2]]
evidences: [["Hulagu Khan", "father", "Tolui"], ["Tolui", "mother", "B\u00f6rte"]]
answer: Börte