Question: who does the voice for the hippo on doc mcstuffins
[{'answer': 'Loretta Devine', 'provenance': [{'wikipedia_id': '35314997', 'title': 'Doc McStuffins', 'start_paragraph_id': 15, 'start_character': 106, 'end_paragraph_id': 15, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Characters.:Main.\n'}]}]