question: Who was older when he became the president of the United States of America, Bill Clinton or Barack Obama?
answerText: Bill Clinton
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questionEntity.entityType: entity
questionEntity.label: United States of America
questionEntity.mention: United States of America,
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questionEntity.label: Bill Clinton
questionEntity.mention: Bill Clinton
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questionEntity.label: Barack Obama
questionEntity.mention: Barack Obama
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answerEntity.label: Bill Clinton