Question: how many states there is in the united states
[{'answer': '50', 'provenance': [{'wikipedia_id': '88366', 'title': 'County (United States)', 'start_paragraph_id': 3, 'start_character': 555, 'end_paragraph_id': 3, 'end_character': 557, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '88366', 'title': 'County (United States)', 'start_paragraph_id': 3, 'start_character': 32, 'end_paragraph_id': 3, 'end_character': 738, 'bleu_score': 0.862194768415768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3309988905311435056}, 'section': 'Section::::Abstract.'}]}]