Question: who plays willow in buffy the vampire slayer
[{'answer': 'Alyson Lee Hannigan', 'provenance': [{'wikipedia_id': '43997', 'title': 'Alyson Hannigan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43997', 'title': 'Alyson Hannigan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 376, 'bleu_score': 0.66438060559259, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18289084246412390124}, 'section': 'Section::::Abstract.'}]}]