Question: when does series 11 of big bang theory start
[{'answer': 'September 25 , 2017', 'provenance': [{'wikipedia_id': '50375161', 'title': 'The Big Bang Theory (season 11)', 'start_paragraph_id': 1, 'start_character': 104, 'end_paragraph_id': 1, 'end_character': 123, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50375161', 'title': 'The Big Bang Theory (season 11)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 0.9493253852526031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1584617009068111371}, 'section': 'Section::::Abstract.'}]}]