Question: who plays dawn in buffy the vampire slayer
[{'answer': 'Michelle Christine Trachtenberg', 'provenance': [{'wikipedia_id': '256004', 'title': 'Michelle Trachtenberg', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]