Question: when does south park new season come out
[{'answer': 'September 13 , 2017', 'provenance': [{'wikipedia_id': '54187403', 'title': 'South Park (season 21)', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54187403', 'title': 'South Park (season 21)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 145, 'bleu_score': 0.9146912192286941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8487368098081736879}, 'section': 'Section::::Abstract.'}]}]