question: Who is the father of Elena Asenina Of Bulgaria?
context: [["Anna Maria of Hungary", ["Anna Maria of Hungary (1204\u20131237) was an Empress consort of Bulgaria, daughter of King Andrew II of Hungary and Gertrude of Merania.", "She was sister of Saint Elizabeth of Hungary.", "In January 1221 she married Tsar Ivan Asen II of Bulgaria as his second wife.", "Her father was forced to agree to the marriage to effect his release from Bulgaria, where he had been captured on his return from Crusade in late 1218.", "Her dowry included the cities of Beograd and Brani\u010devo.", "Anna Maria and Ivan Asen II had several children, including:", "She died of the plague in 1237 and was buried at SS.", "Forty Martyrs Church in Tarnovo."]], ["Albert E. Austin", ["Albert Elmer Austin( November 15, 1877 \u2013 January 26, 1942) was a Republican member of the United States House of Representatives from 1939 to 1941 and member of the Connecticut House of Representatives from 1917 to 1919 and from 1921 to 1923.", "He was the stepfather of Clare Boothe Luce."]], ["Albert Visetti", ["Albert Anthony Visetti( 13 May 1846\u201310 July 1928) was a Dalmatian musician who moved to London where he was Professor of Singing at the Royal College of Music, becoming a Fellow in 1921.", "He was the stepfather of the novelist Radclyffe Hall."]], ["H\u00e9ctor Barrantes", ["H\u00e9ctor Barrantes Sansoni( 1939\u20131990) was an Argentine polo player.", "He was the stepfather of Sarah, Duchess of York."]], ["Gerald Rudolff Ford", ["Gerald Rudolff Ford( December 9, 1890 \u2013 January 26, 1962) was an American businessman, creator of Ford Industries, and Republican politician who was the stepfather of U.S. President Gerald Ford and for whom Ford legally changed his name."]], ["Elena Asenina of Bulgaria", ["Elena of Bulgaria was an empress consort of Nicaea, married to Theodore II Laskaris (r. 1254\u20131258).", "She was daughter of Bulgarian Emperor Ivan Asen II and Anna Maria of Hungary."]], ["Lolo Soetoro", ["Lolo Soetoro", "( EYD: Lolo Sutoro;; 2 January 1935 \u2013 2 March 1987), also known as Lolo Soetoro Mangunharjo or Mangundikardjo, of Indonesia was the stepfather of Barack Obama, the 44th President of the United States."]], ["Morris Harvey", ["Morris Harvey( 1877\u2013 1944) was a British actor and writer.", "A renowned character actor, he also wrote for the stage, including material for Broadway revues, in which he also appeared.", "He was the stepfather of film director Anthony Harvey."]], ["Jerrold Wexler", ["Jerrold Wexler( June 27, 1924 \u2013 November 10, 1992) was a noted American businessman and film producer.", "He was the brother of cinematographer Haskell Wexler and the stepfather of actress Daryl Hannah."]], ["Maria Asenina of Bulgaria", ["Maria Asenina of Bulgaria was a Bulgarian princess and empress consort.", "She was the consort of Emperor Mitso Asen of Bulgaria( reigned 1256 \u2013 1257).", "She was the daughter of Emperor Ivan Asen II of Bulgaria and Empress Irene Komnene of Epirus.", "Through her mother, she was a granddaughter of Theodore of Epirus.", "She is mother of Bulgarian Emperor Ivan Asen III( r. 1279 \u2013 1280) and of Bulgarian Empress Kira Maria, who married Emperor George I of Bulgaria."]]]
supporting_facts: [["Elena Asenina of Bulgaria", 1], ["Anna Maria of Hungary", 2]]
evidences: [["Elena of Bulgaria", "mother", "Anna Maria of Hungary"], ["Anna Maria of Hungary", "spouse", "Ivan Asen II of Bulgaria"]]
answer: Ivan Asen II of Bulgaria