Question: how long was the cosby show on the air
[{'answer': 'eight seasons', 'provenance': [{'wikipedia_id': '170325', 'title': 'The Cosby Show', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 113, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '170325', 'title': 'The Cosby Show', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 251, 'bleu_score': 0.740947446142591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1817960505058722610}, 'section': 'Section::::Abstract.'}]}]