Question: who sings the song if i could turn back time
[{'answer': 'Cher', 'provenance': [{'wikipedia_id': '5510071', 'title': 'If I Could Turn Back Time', 'start_paragraph_id': 1, 'start_character': 78, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]