Question: who win the best actor award in 2017
[{'answer': 'Riddhi Sen', 'provenance': [{'wikipedia_id': '3731898', 'title': 'National Film Award for Best Actor', 'start_paragraph_id': 3, 'start_character': 617, 'end_paragraph_id': 3, 'end_character': 627, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]