question: Who is the paternal grandfather of Marquis Xuan Of Cai?
context: [["Marquis Dai of Cai", ["Marquis Dai of Cai (\u8521\u6234\u4faf)", "(?", "- 750 BC; his name is lost to history) was the tenth ruler of the State of Cai from 760 BC to 750 BC.", "He was the only known son of Marquis G\u00f2ng of Cai (\u8521\u5171\u4faf), his predecessor.", "His reign lasted for 10 years.", "He was succeeded by his son."]], ["Earl Huang of Cai", ["Huang, Earl of Cai, born Ji Huang, was an ancient Chinese noble from the Zhou dynasty and the third ruler of the ancient Chinese state of Cai. Huang was the only known son of Zhong Hu of Cai and the second cousin of Kings Cheng and Kang of Zhou.", "His son inherited his land as Marquis G\u014dng of Cai, with a higher title,\" hou\" rather than\" bo\"."]], ["Marquis Ai of Cai", ["Marquis Ai of Cai( \u8521\u54c0\u4faf)( died 675 BC), born J\u012b Xi\u00e0nw\u01d4( \u59eb\u737b\u821e), was the thirteenth ruler of the State of Cai from 695 BC to 675 BC.", "He was the only known son of Marquis Huan of Cai( \u8521\u6853\u4faf), his predecessor.", "His reign was a period of 20 years.", "In the autumn of 684 BC, King Wen of Chu conquered the State of Cai and took the reigning Marquis as a prisoner of war.", "But King Wen of Chu restored the state after Marquis Ai praised Madam X\u012b( \u606f\u59ab).", "He was succeeded by his son."]], ["Marquis G\u014dng of Cai", ["Marquis G\u014dng of Cai( C\u00e0i G\u014dngh\u00f3u \u8521\u5bae\u4faf), born as Ji?( \u59ec?), was the fourth ruler of the State of Cai.", "He was the only known son of Earl Huang of Cai( \u8521\u4f2f\u8352) and close kin of King of Zhou.", "He was the first in the family to hold the title of the\" Marquis of Cai( Cai Guohou \u8521\u56fd\u4faf)\" which would be in used until the end of the State of Cai in 447 BC.", "He was succeeded by his son."]], ["Marquis Li of Cai", ["Marquis L\u00ec of Cai( \u8521\u53b2\u4faf)( died 863 BC), ancestral name Ji( \u59ec), given name unknown, was the fifth ruler of the State of Cai.", "He was the only known son of Marquis G\u014dng of Cai.", "He was succeeded by his son."]], ["Marquis Xuan of Cai", ["Marquis Xuan of Cai (\u8521\u5ba3\u4faf)", "(? - 715 BC),", "born Ji Cu\u00f2fu (\u59ec\u63aa\u7236)", ", was the eleventh ruler of the State of Cai from 750 BC to 715 BC.", "He was the only known son of Marquis Dai of Cai (\u8521\u6234\u4faf), his predecessor.", "His reign for 35 years.", "He was succeeded by his son."]], ["Marquis Huan of Cai", ["Marquis Huan of Cai( \u8521\u6853\u4faf) (?- 695 BC), born J\u012b F\u0113ngr\u00e9n( \u59eb\u5c01\u4eba), was the twelve ruler of the State of Cai from 715 BC to 695 BC.", "He was the only known son of Marquis Xuan of Cai( \u8521\u5ba3\u4faf), his predecessor.", "His reign was a period of 20 years.", "He was succeeded by his son."]], ["Marquis Yi of Cai", ["Marquis Yi of Cai( \u8521\u5937\u4faf)( died 809 BC), born as Ji?( \u59ec?; his name is lost to history), was the seventh ruler of the State of Cai from 837 BC to 809 BC.", "He was the only known son of Marquis Wu of Cai( \u8521\u6b66\u4faf).", "His reign lasted for 28 years like his father's.", "He was succeeded by his son."]], ["Marquis Wu of Cai", ["Marquis Wu of Cai( \u8521\u6b66\u4faf)( died 837 BC), born as Ji?( \u59ec?; his name is lost to history), was the sixth ruler of the State of Cai from 863 BC to 837 BC.", "He was the only known son of Marquis L\u00ec of Cai( \u8521\u53b2\u4faf), his predecessor.", "His reign lasted for 28 years.", "He was succeeded by his son."]], ["Marquis Xi of Cai", ["Marquis Xi of Cai( \u8521\u91d0\u4faf)( died 761 BC), given name Su\u01d2shi( \u6240\u4e8b), was the eight ruler of the State of Cai from 809 BC to 761 BC.", "He was the only known son of Marquis Yi of Cai( \u8521\u5937\u4faf), his predecessor.", "His reign lasted for 48 years, the longest reign in Cai history.", "He was succeeded by his son."]]]
supporting_facts: [["Marquis Xuan of Cai", 4], ["Marquis Dai of Cai", 3]]
evidences: [["Marquis Xuan of Cai", "father", "Marquis Dai of Cai"], ["Marquis Dai of Cai", "father", "Marquis G\u00f2ng of Cai"]]
answer: Marquis Gòng of Cai