Question: when did the show big bang theory start
[{'answer': 'September 24 , 2007', 'provenance': [{'wikipedia_id': '11269605', 'title': 'The Big Bang Theory', 'start_paragraph_id': 78, 'start_character': 56, 'end_paragraph_id': 78, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Broadcast.\n'}]}, {'provenance': [{'wikipedia_id': '11269605', 'title': 'The Big Bang Theory', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 350, 'bleu_score': 0.512440660422776, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13881761087704924610}, 'section': 'Section::::Abstract.'}]}]