Question: who won best supporting actor at the 89th academy awards held in february 2017
[{'answer': 'Mahershala Ali', 'provenance': [{'wikipedia_id': '49329502', 'title': '89th Academy Awards', 'start_paragraph_id': 3, 'start_character': 169, 'end_paragraph_id': 3, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]