question: How many US presidents were involved in the Vietnam war?
answerText: 5
questionEntity.name: Q8740
questionEntity.entityType: entity
questionEntity.label: Vietnam War
questionEntity.mention: Vietnam war
questionEntity.name: Q30
questionEntity.entityType: entity
questionEntity.label: United States of America
questionEntity.mention: US
answerEntity.name: Q9640
answerEntity.label: Lyndon B. Johnson
answerEntity.name: Q9696
answerEntity.label: John F. Kennedy
answerEntity.name: Q9916
answerEntity.label: Dwight D. Eisenhower
answerEntity.name: Q11613
answerEntity.label: Harry S Truman
answerEntity.name: Q9588
answerEntity.label: Richard Nixon