Question: who was the 39th president of the united states of america
[{'answer': 'James Earl Carter Jr.', 'provenance': [{'wikipedia_id': '15992', 'title': 'Jimmy Carter', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15992', 'title': 'Jimmy Carter', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 451, 'bleu_score': 0.639627061131764, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7862102303994578345}, 'section': 'Section::::Abstract.'}]}]