Question: who played the role of betal in vikram betal
[{'answer': 'Sajjan', 'provenance': [{'wikipedia_id': '21716403', 'title': 'Vikram Aur Betaal', 'start_paragraph_id': 8, 'start_character': 12, 'end_paragraph_id': 8, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]