Question: who is rated the best president of the united states
[{'answer': 'George Washington', 'provenance': [{'wikipedia_id': '1855342', 'title': 'Historical rankings of presidents of the United States', 'start_paragraph_id': 3, 'start_character': 44, 'end_paragraph_id': 3, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::General findings.\n'}]}, {'provenance': [{'wikipedia_id': '1855342', 'title': 'Historical rankings of presidents of the United States', 'start_paragraph_id': 34, 'start_character': 0, 'end_paragraph_id': 34, 'end_character': 229, 'bleu_score': 0.9419661180380051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10374776876526629066}, 'section': 'Section::::Public opinion polls.:Rasmussen poll.\n'}]}]