Question: what did cher win an academy award for
[{'answer': 'Best Actress', 'provenance': [{'wikipedia_id': '10683275', 'title': 'List of awards and nominations received by Cher', 'start_paragraph_id': 1, 'start_character': 416, 'end_paragraph_id': 1, 'end_character': 428, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]