Question: who was the 37 president of the united states
[{'answer': 'Richard Milhous Nixon', 'provenance': [{'wikipedia_id': '25473', 'title': 'Richard Nixon', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25473', 'title': 'Richard Nixon', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 368, 'bleu_score': 0.7049403247858911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11974244559894666954}, 'section': 'Section::::Abstract.'}]}]