Question: who sings the theme song of doc mcstuffins
[{'answer': 'China Anne McClain', 'provenance': [{'wikipedia_id': '35314997', 'title': 'Doc McStuffins', 'start_paragraph_id': 33, 'start_character': 40, 'end_paragraph_id': 33, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Characters.:Recurring.\n'}]}]