Question: who sings the part of anna in frozen
[{'answer': 'Kristen Bell', 'provenance': [{'wikipedia_id': '39696639', 'title': 'Anna (Frozen)', 'start_paragraph_id': 1, 'start_character': 144, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Katie Lopez', 'provenance': [{'wikipedia_id': '39696639', 'title': 'Anna (Frozen)', 'start_paragraph_id': 1, 'start_character': 222, 'end_paragraph_id': 1, 'end_character': 233, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Agatha Lee Monn', 'provenance': [{'wikipedia_id': '39696639', 'title': 'Anna (Frozen)', 'start_paragraph_id': 1, 'start_character': 305, 'end_paragraph_id': 1, 'end_character': 320, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39696639', 'title': 'Anna (Frozen)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 362, 'bleu_score': 0.9262685672663881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10781673371144074696}, 'section': 'Section::::Abstract.'}]}]