Question: who plays tiana's mom in the princess and the frog
[{'answer': 'Oprah Winfrey', 'provenance': [{'wikipedia_id': '6141751', 'title': 'The Princess and the Frog', 'start_paragraph_id': 1, 'start_character': 584, 'end_paragraph_id': 1, 'end_character': 597, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6141751', 'title': 'The Princess and the Frog', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 215, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13662013917078216755}, 'section': 'Section::::Cast.\n'}]}]