Question: who is bruno mars song when i was your man about
[{'answer': 'Jessica Caban', 'provenance': [{'wikipedia_id': '37825120', 'title': 'When I Was Your Man', 'start_paragraph_id': 1, 'start_character': 560, 'end_paragraph_id': 1, 'end_character': 573, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37825120', 'title': 'When I Was Your Man', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1375, 'bleu_score': 0.8382397260443031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5730751972297950527}, 'section': 'Section::::Composition and lyrics.\n'}]}]