Question: who played the role of milkha singh in the bhaag milkha bhaag
[{'answer': 'Farhan Akhtar', 'provenance': [{'wikipedia_id': '34501652', 'title': 'Bhaag Milkha Bhaag', 'start_paragraph_id': 1, 'start_character': 273, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]