Question: who played buffy on buffy the vampire slayer
[{'answer': 'Sarah Michelle Gellar', 'provenance': [{'wikipedia_id': '47542', 'title': 'Buffy the Vampire Slayer', 'start_paragraph_id': 2, 'start_character': 143, 'end_paragraph_id': 2, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'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': 3392103715249124565}, 'section': 'Section::::Abstract.'}]}]