Question: who did the ballet dancing in black swan
[{'answer': 'Sarah Lane', 'provenance': [{'wikipedia_id': '31379348', 'title': 'Black Swan dance double controversy', 'start_paragraph_id': 1, 'start_character': 451, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31379348', 'title': 'Black Swan dance double controversy', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 0.9748377259086851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3412969764399979425}, 'section': 'Section::::Abstract.'}]}]