What role does Ghanashyam Nayak play in India's longest running sitcom serial?
Ghanashyam Nayak: Ghanashyam Nayak is an Indian film and television actor. Ghanashyam Nayak:  He is currently playing the role of Natwarlal Prabhashankar Undhaiwala a.k.a. Nattu Kaka in "Taarak Mehta Ka Ooltah Chashmah". Taarak Mehta Ka Ooltah Chashmah: Taarak Mehta Ka Ooltah Chashmah (English: Taarak Mehta's Different Perspective) is India's longest running sitcom serial.
Natwarlal Prabhashankar Undhaiwala