question: How many U.S. presidents owned slaves?
answerText: 12
questionEntity.name: Q30
questionEntity.entityType: entity
questionEntity.label: United States of America
questionEntity.mention: U.S.
answerEntity.name: Q23
answerEntity.label: George Washington
answerEntity.name: Q8612
answerEntity.label: Andrew Johnson
answerEntity.name: Q34836
answerEntity.label: Ulysses S Grant
answerEntity.name: Q11812
answerEntity.label: Thomas Jefferson
answerEntity.name: Q11813
answerEntity.label: James Madison
answerEntity.name: Q11815
answerEntity.label: James Monroe
answerEntity.name: Q11817
answerEntity.label: Andrew Jackson
answerEntity.name: Q11820
answerEntity.label: Martin Van Buren
answerEntity.name: Q11881
answerEntity.label: John Tyler
answerEntity.name: Q11891
answerEntity.label: James K. Polk
answerEntity.name: Q11896
answerEntity.label: Zachary Taylor
answerEntity.name: Q11869
answerEntity.label: William Henry Harrison