Question: what is most popular sport in the usa
[{'answer': 'American football', 'provenance': [{'wikipedia_id': '2257795', 'title': 'Sports in the United States', 'start_paragraph_id': 1, 'start_character': 71, 'end_paragraph_id': 1, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2257795', 'title': 'Sports in the United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1139, 'bleu_score': 0.7046084827840481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7303492332493242939}, 'section': 'Section::::Abstract.'}]}]