Question: when does season 6 of once upon a time start
[{'answer': 'September 25 , 2016', 'provenance': [{'wikipedia_id': '49666317', 'title': 'Once Upon a Time (season 6)', 'start_paragraph_id': 1, 'start_character': 114, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49666317', 'title': 'Once Upon a Time (season 6)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 330, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5105748169996380978}, 'section': 'Section::::Abstract.'}]}]