Question: who plays elsa in olaf's frozen adventure
[{'answer': 'Idina Menzel', 'provenance': [{'wikipedia_id': '54293332', 'title': "Olaf's Frozen Adventure", 'start_paragraph_id': 1, 'start_character': 333, 'end_paragraph_id': 1, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Eva Bella', 'provenance': [{'wikipedia_id': '54293332', 'title': "Olaf's Frozen Adventure", 'start_paragraph_id': 10, 'start_character': 12, 'end_paragraph_id': 10, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '54293332', 'title': "Olaf's Frozen Adventure", 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 85, 'bleu_score': 0.5303784722436511, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10786143842419598823}, 'section': 'Section::::Cast.\n'}]}]