Question: What role does Ghanashyam Nayak play in India's longest running sitcom serial?
{'answer': 'Natwarlal Prabhashankar Undhaiwala', 'supporting_facts': [['Ghanashyam Nayak', 0], ['Ghanashyam Nayak', 2], ['Taarak Mehta Ka Ooltah Chashmah', 0]]}