Question: when did the song selfish by rihanna come out
[{'answer': 'February 28 , 2017', 'provenance': [{'wikipedia_id': '53286617', 'title': 'Selfish (Future song)', 'start_paragraph_id': 1, 'start_character': 185, 'end_paragraph_id': 1, 'end_character': 203, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53286617', 'title': 'Selfish (Future song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 260, 'bleu_score': 0.953991849837532, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 401003950870449463}, 'section': 'Section::::Abstract.'}]}]