Question: when does nfl football season start for 2018
[{'answer': 'September 6 , 2018', 'provenance': [{'wikipedia_id': '48479614', 'title': '2018 NFL season', 'start_paragraph_id': 1, 'start_character': 99, 'end_paragraph_id': 1, 'end_character': 117, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '48479614', 'title': '2018 NFL season', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 384, 'bleu_score': 0.7236008543865871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8114072142590523951}, 'section': 'Section::::Abstract.'}]}]