Question: when does the regular season start for the nfl
[{'answer': 'September 7', 'provenance': [{'wikipedia_id': '44726936', 'title': '2017 NFL season', 'start_paragraph_id': 1, 'start_character': 114, 'end_paragraph_id': 1, 'end_character': 125, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44726936', 'title': '2017 NFL season', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 541, 'bleu_score': 0.795330305207943, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1534240942323700956}, 'section': 'Section::::Regular season.\n'}]}]