Question: when is season 7 coming for once upon a time
[{'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.'}]}]