Question: who wrote rihanna's love on the brain
[{'answer': 'Fred Ball', 'provenance': [{'wikipedia_id': '48210092', 'title': 'Love on the Brain', 'start_paragraph_id': 1, 'start_character': 148, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Joseph Angel', 'provenance': [{'wikipedia_id': '48210092', 'title': 'Love on the Brain', 'start_paragraph_id': 1, 'start_character': 119, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Robyn Fenty'}]