Question: when does season 7 of once upon a time air
[{'answer': 'October 6 , 2017', 'provenance': [{'wikipedia_id': '54030079', 'title': 'Once Upon a Time (season 7)', 'start_paragraph_id': 1, 'start_character': 179, 'end_paragraph_id': 1, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54030079', 'title': 'Once Upon a Time (season 7)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 194, 'bleu_score': 0.688222595430075, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16962544013446950423}, 'section': 'Section::::Abstract.'}]}]