Question: who wrote the song when i was your man
[{'answer': 'Bruno Mars', 'provenance': [{'wikipedia_id': '37825120', 'title': 'When I Was Your Man', 'start_paragraph_id': 1, 'start_character': 66, 'end_paragraph_id': 1, 'end_character': 76, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Philip Lawrence', 'provenance': [{'wikipedia_id': '37825120', 'title': 'When I Was Your Man', 'start_paragraph_id': 1, 'start_character': 364, 'end_paragraph_id': 1, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ari Levine', 'provenance': [{'wikipedia_id': '37825120', 'title': 'When I Was Your Man', 'start_paragraph_id': 1, 'start_character': 381, 'end_paragraph_id': 1, 'end_character': 391, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Andrew Wyatt', 'provenance': [{'wikipedia_id': '37825120', 'title': 'When I Was Your Man', 'start_paragraph_id': 1, 'start_character': 396, 'end_paragraph_id': 1, 'end_character': 408, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]