Question: what role did marni nixon play in sound of music
[{'answer': 'Sister Sophia', 'provenance': [{'wikipedia_id': '477971', 'title': 'Marni Nixon', 'start_paragraph_id': 9, 'start_character': 485, 'end_paragraph_id': 9, 'end_character': 498, 'bleu_score': 1.0, 'section': 'Section::::Career.:Early films and musicals.\n'}]}, {'provenance': [{'wikipedia_id': '477971', 'title': 'Marni Nixon', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1060, 'bleu_score': 0.9891004105789801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12231369649613024574}, 'section': 'Section::::Career.:Early films and musicals.\n'}]}]