Question: when did buffy the vampire slayer first air
[{'answer': 'March 10 , 1997', 'provenance': [{'wikipedia_id': '47542', 'title': 'Buffy the Vampire Slayer', 'start_paragraph_id': 42, 'start_character': 42, 'end_paragraph_id': 42, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Production.:Broadcast history and syndication.\n'}]}, {'provenance': [{'wikipedia_id': '47542', 'title': 'Buffy the Vampire Slayer', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 696, 'bleu_score': 0.693988184261057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7571583059724316712}, 'section': 'Section::::Abstract.'}]}]