Question: when did american bandstand go off the air
[{'answer': 'October 7 , 1989', 'provenance': [{'wikipedia_id': '188737', 'title': 'American Bandstand', 'start_paragraph_id': 32, 'start_character': 409, 'end_paragraph_id': 32, 'end_character': 425, 'bleu_score': 1.0, 'section': 'Section::::Changes to "Bandstand".:Move from ABC to syndication and the USA Network.\n'}]}]