Question: when did mr. rogers go off the air
[{'answer': 'August 31 , 2001', 'provenance': [{'wikipedia_id': '137896', 'title': "Mister Rogers' Neighborhood", 'start_paragraph_id': 9, 'start_character': 102, 'end_paragraph_id': 9, 'end_character': 118, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]