Question: when does the arena football season start 2017
[{'answer': 'April 7 , 2017', 'provenance': [{'wikipedia_id': '52923774', 'title': '2017 Arena Football League season', 'start_paragraph_id': 1, 'start_character': 318, 'end_paragraph_id': 1, 'end_character': 332, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52923774', 'title': '2017 Arena Football League season', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 526, 'bleu_score': 0.751627532269697, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17508215121819225702}, 'section': 'Section::::Abstract.'}]}]