Question: who won the most national awards for best actor
[{'answer': 'Amitabh Bachchan', 'provenance': [{'wikipedia_id': '3731898', 'title': 'National Film Award for Best Actor', 'start_paragraph_id': 3, 'start_character': 190, 'end_paragraph_id': 3, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3731898', 'title': 'National Film Award for Best Actor', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 800, 'bleu_score': 0.768921211067853, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11041455194446375282}, 'section': 'Section::::Abstract.'}]}]