Question: who wrote beyonce song if i were a boy
[{'answer': 'BC Jean', 'provenance': [{'wikipedia_id': '19217023', 'title': 'If I Were a Boy', 'start_paragraph_id': 1, 'start_character': 158, 'end_paragraph_id': 1, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Toby Gad', 'provenance': [{'wikipedia_id': '19217023', 'title': 'If I Were a Boy', 'start_paragraph_id': 1, 'start_character': 170, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]