question: Who is Mamie Lincoln Isham's paternal grandmother?
context: [["H\u00fcma Hatun", ["H\u00fcma Hatun (1410 \u2012 September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II."]], ["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."]], ["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."]], ["Robert Todd Lincoln", ["Robert Todd Lincoln (August 1, 1843 \u2013 July 26, 1926) was an American politician, lawyer, and businessman.", "The first son of President Abraham Lincoln and Mary Todd Lincoln, Robert Lincoln was born in Springfield, Illinois, and graduated from Harvard College before serving on the staff of Ulysses S. Grant as a captain in the Union Army in the closing days of the American Civil War.", "After the war, Lincoln married Mary Eunice Harlan, and they had three children together, two of whom survived to adulthood.", "Following completion of law school in Chicago, he built a successful law practice, and became wealthy representing corporate clients.", "Active in Republican politics, and a tangible symbol of his father's legacy, Lincoln was often spoken of as a possible candidate for office, including the presidency, but never took steps to mount a campaign.", "The one office to which he was elected was town supervisor of South Chicago, which he held from 1876 to 1877; the town later became part of the city of Chicago.", "Lincoln accepted appointments as secretary of war in the administration of James A. Garfield, continuing under Chester A. Arthur, and as United States Ambassador to the United Kingdom (with the role then titled as \"minister\") in the Benjamin Harrison administration.", "Lincoln served as general counsel of the Pullman Palace Car Company, and after founder George Pullman died in 1897, Lincoln became the company's president.", "After retiring from this position in 1911, Lincoln served as chairman of the board until 1922.", "In Lincoln's later years he resided at homes in Washington, D.C. and Manchester, Vermont; the Manchester home, Hildene, was added to the National Register of Historic Places in 1977.", "In 1922, he took part in the dedication ceremonies for the Lincoln Memorial.", "Lincoln died at Hildene on July 26, 1926, six days before his 83rd birthday, and was buried at Arlington National Cemetery."]], ["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."]], ["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."]], ["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."]], ["Mamie Lincoln Isham", ["Mary Todd \"Mamie\" Lincoln Isham (October 15, 1869 \u2013 November 21, 1938) was a granddaughter of Abraham Lincoln, the first daughter of Robert Todd Lincoln and the mother of Lincoln Isham."]], ["G\u00fclbahar Hatun (wife of Mehmed II)", ["G\u00fclbahar Hatun( 1432 \u2013 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I."]]]
supporting_facts: [["Mamie Lincoln Isham", 0], ["Robert Todd Lincoln", 1]]
evidences: [["Mary Todd \"Mamie\" Lincoln Isham", "father", "Robert Todd Lincoln"], ["Robert Todd Lincoln", "mother", "Mary Todd Lincoln"]]
answer: Mary Todd Lincoln