Question: how many episodes of big bang theory are there
[{'answer': '246'}, {'provenance': [{'wikipedia_id': '13542396', 'title': 'List of The Big Bang Theory episodes', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 245, 'bleu_score': 0.57706343519337, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7849953864623732074}, 'section': 'Section::::Abstract.'}]}]