Question: how many sessions of big bang theory are there
[{'answer': '11', 'provenance': [{'wikipedia_id': '11269605', 'title': 'The Big Bang Theory', 'start_paragraph_id': 3, 'start_character': 653, 'end_paragraph_id': 3, 'end_character': 655, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]