question: Who is Eva Chamberlain's maternal grandmother?
context: [["Cosima von B\u00fclow Pavoncelli", ["Countess Cosima von B\u00fclow Pavoncelli( born 15 April 1967) is a British socialite and philanthropist of American, Danish and German ancestry and daughter of the lawyer Claus von B\u00fclow and Sunny von B\u00fclow.", "She was named on the International Best Dressed List Hall of Fame in 1999."]], ["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."]], ["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."]], ["Eva Chamberlain", ["Eva Chamberlain (1867\u20131942) born Eva Maria von B\u00fclow, was the daughter of Richard Wagner and Cosima Wagner, and the wife of Houston Stewart Chamberlain.", "When she was born, her mother was still married to Hans von B\u00fclow.", "Through her mother, she was also a granddaughter of Franz Liszt.", "With her siblings Isolde and Siegfried, Eva was brought up by a house teacher.", "In 1906 Eva took over the care of the sick mother at Villa Wahnfried in Bayreuth, took care of her mail, and was the only family member to have access to the family archive.", "In 1908 she married Houston Stewart Chamberlain.", "They acquired a stately villa \u2013 now the Jean Paul Museum \u2013 next to the Villa Wahnfried, and moved into it in 1916", "In the 1920s and 1930s, she and her sister Daniela were the head of the Altwagnerians who opposed any modernization of Richard Wagner's works.", "In 1933 she received the honorary citizenship of the city of Bayreuth.", "She was also a bearer of the Golden Party Badge of the Nazi Party.", "When she died of cancer in 1942, she was given an honorary funeral of the NSDAP, in which Adolf Wagner gave the eulogy."]], ["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."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["Cosima Wagner", ["Cosima Wagner (born Francesca Gaetana Cosima Liszt; 24 December 1837 \u2013 1 April 1930) was the illegitimate daughter of the Hungarian pianist and composer Franz Liszt and Marie d'Agoult.", "She became the second wife of the German composer Richard Wagner, and with him founded the Bayreuth Festival as a showcase for his stage works; after his death she devoted the rest of her life to the promotion of his music and philosophy.", "Commentators have recognised Cosima as the principal inspiration for Wagner's later works, particularly \"Parsifal\".", "In 1857, after a childhood largely spent under the care of her grandmother and with governesses, Cosima married the conductor Hans von B\u00fclow.", "Although the marriage produced two children, it was largely a loveless union, and in 1863 Cosima began a relationship with Wagner, who was 24 years her senior.", "She married him in 1870; after his death in 1883 she directed the Bayreuth Festival for more than 20 years, increasing its repertoire to form the Bayreuth canon of ten operas and establishing the festival as a major event in the world of musical theatre.", "During her directorship, Cosima opposed theatrical innovations and adhered closely to Wagner's original productions of his works, an approach continued by her successors long after her retirement in 1907.", "She shared Wagner's convictions of German cultural and racial superiority, and under her influence, Bayreuth became increasingly identified with antisemitism.", "This was a defining aspect of Bayreuth for decades, into the Nazi era which closely followed her death in 1930.", "Thus, although she is widely perceived as the saviour of the festival, her legacy remains controversial."]], ["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."]], ["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."]], ["Marie von Buelow", ["Marie Schanzer von B\u00fclow( 1857\u20131941) was an Austrian- German stage and film actress.", "In July 1882, she married the pianist and conductor Hans von B\u00fclow."]]]
supporting_facts: [["Eva Chamberlain", 0], ["Cosima Wagner", 0]]
evidences: [["Eva Chamberlain", "mother", "Cosima Wagner"], ["Cosima Wagner", "mother", "Marie d'Agoult"]]
answer: Marie d'Agoult