Question: who was the president of the united states in 1970
[{'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': 0.649410146926344, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15096963047736842945}, 'section': 'Section::::Abstract.'}]}]