Question: what are the most popular sports in usa
[{'answer': 'Football', 'provenance': [{'wikipedia_id': '2257795', 'title': 'Sports in the United States', 'start_paragraph_id': 2, 'start_character': 171, 'end_paragraph_id': 2, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'basketball', 'provenance': [{'wikipedia_id': '2257795', 'title': 'Sports in the United States', 'start_paragraph_id': 1, 'start_character': 168, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'baseball', 'provenance': [{'wikipedia_id': '2257795', 'title': 'Sports in the United States', 'start_paragraph_id': 1, 'start_character': 158, 'end_paragraph_id': 1, 'end_character': 166, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'soccer', 'provenance': [{'wikipedia_id': '2257795', 'title': 'Sports in the United States', 'start_paragraph_id': 1, 'start_character': 184, 'end_paragraph_id': 1, 'end_character': 190, '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': 0.64657793547333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8576372288136961460}, 'section': 'Section::::Abstract.'}]}]