Question: who plays ice queen in once upon a time
[{'answer': 'Elizabeth Mitchell', 'provenance': [{'wikipedia_id': '2388970', 'title': 'Elizabeth Mitchell', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2388970', 'title': 'Elizabeth Mitchell', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 506, 'bleu_score': 0.514001663969013, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 439946491439382566}, 'section': 'Section::::Abstract.'}]}]