Question: who played the role of arjun in old mahabharat
[{'answer': 'Firoz Khan', 'provenance': [{'wikipedia_id': '35535300', 'title': 'Arjun (Firoz Khan)', 'start_paragraph_id': 0, 'start_character': 7, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35535300', 'title': 'Arjun (Firoz Khan)', 'start_paragraph_id': 1, 'start_character': 6, 'end_paragraph_id': 1, 'end_character': 423, 'bleu_score': 0.6236232550150951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17095330496184975995}, 'section': 'Section::::Abstract.'}]}]