Question: when does season 6 of once upon a time come out
[{'answer': 'May 14 , 2017', 'provenance': [{'wikipedia_id': '49666317', 'title': 'Once Upon a Time (season 6)', 'start_paragraph_id': 1, 'start_character': 151, 'end_paragraph_id': 1, 'end_character': 164, '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': 15875305630105895463}, 'section': 'Section::::Abstract.'}]}]