Question: who did oprah winfrey play in the color purple
[{'answer': 'Sofia Johnson', 'provenance': [{'wikipedia_id': '3185575', 'title': 'The Color Purple (film)', 'start_paragraph_id': 16, 'start_character': 29, 'end_paragraph_id': 16, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '3185575', 'title': 'The Color Purple (film)', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 42, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16843341247271710090}, 'section': 'Section::::Cast.\n'}]}]