Question: when does once upon a time season 7 start
[{'answer': 'on October 6 , 2017', 'provenance': [{'wikipedia_id': '54030079', 'title': 'Once Upon a Time (season 7)', 'start_paragraph_id': 1, 'start_character': 176, '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': 0.901685728376533, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6410104395040963417}, 'section': 'Section::::Abstract.'}]}]