Question: What role does Ghanashyam Nayak play in India's longest running sitcom serial?

Context paragraphs:
Shailesh Lodha: Shailesh Lodha is an Indian actor, comedian and writer.  He is widely recognized for his role of Taarak Mehta (a real life Gujarati columnist) in the India's longest running sitcom serial Taarak Mehta Ka Ooltah Chashmah, which he is portraying since July 2008.

Kathy Staff: Kathy Staff (12 July 1928 – 13 December 2008), born Minnie Higginbottom, was an English actress, well known for her work on British television.  She is most famous for her portrayal of Nora Batty on the longest running sitcom in the world, "Last of the Summer Wine".

Taarak Mehta Ka Ooltah Chashmah: Taarak Mehta Ka Ooltah Chashmah (English: Taarak Mehta's Different Perspective) is India's longest running sitcom serial.  It is produced by Neela Tele Films Private Limited.  The show went on air on July 28, 2008.  It airs from Monday to Friday on SAB TV.  Reruns of the show started on Sony Pal on November 2, 2015.

Sonalika Joshi: Sonalika Joshi (born 5 June 1976) is an Indian television actress.  She is better known for her character of 'Madhavi Bhide' in India's longest running Sitcom TV serial Taarak Mehta Ka Ooltah Chashmah.

Comedy Playhouse: Comedy Playhouse is a long-running British anthology series of one-off unrelated sitcoms that aired for 120 episodes from 1961 to 1975.  Many episodes later graduated to their own series, including "Steptoe and Son", "Meet the Wife", "Till Death Us Do Part", "All Gas and Gaiters", "Up Pompeii! ", "Not in Front of the Children", "Me Mammy", "That's Your Funeral", "The Liver Birds", "Are You Being Served? " and "Last of the Summer Wine", which is the world's longest running sitcom, having run from January 1973 to August 2010.

Sennin Buraku: Sennin Buraku (仙人部落 , roughly Hermit Village) is a manga series by Kō Kojima which ran in the adult magazine "Weekly Asahi Geinō", published by Tokuma Shoten in Japan.  It is the longest running comic with only one artist, being published weekly since October 1956, and the longest-running strip ever in Japan.  By contrast, "Golgo 13" is the longest running manga to be serialized in a dedicated manga magazine with "Doraemon" the second longest, and "Kochira Katsushika-ku Kameari Kōen-mae Hashutsujo" ("Kochi-Kame") the third longest (Asahi Geino is not a dedicated manga magazine).  While "Sennin Buraku" has been running for more years than "Peanuts", Charles M. Schulz's strip has more "episodes" as it ran daily rather than weekly.  The story was a romantic comedy taking place in historical China, and it was quite risqué for its time.  The characters were very traditionally dressed (e.g. all wearing hanfu).  Although the anime is very hard to find, it has been rerun on Japanese television, its intro and outro has appeared on DVD, and an episode has resurfaced on Nico Nico Douga.

Ghanashyam Nayak: Ghanashyam Nayak is an Indian film and television actor.  He has appeared in a number of tele serials as well as films.  He is currently playing the role of Natwarlal Prabhashankar Undhaiwala a.k.a. Nattu Kaka in "Taarak Mehta Ka Ooltah Chashmah".  By qualification he is tenth pass.

Of Funerals and Fish: "Of Funerals and Fish" is the pilot episode of the worlds longest running sitcom "Last of the Summer Wine" (1973–2010) written by Roy Clarke.  Starring Bill Owen, Peter Sallis and Michael Bates.  It was first aired on 4 January 1973 and became the first of 295 episodes.  It was aired as a "Comedy Playhouse" episode.  The plot was that the trio went around discussing life and death.  It also was the first appearance of Kathy Staff although her character was at this point only known as Mrs Batty rather than Nora.  Her husband, unseen in this first episode, is referred to as Harold; when the character went on to appear in the series, he would be called Wally.

Neha Mehta: Neha Mehta (born 9 June 1978) is an Indian television actress.  She is best known for her role of Anjali Mehta in India's longest running sitcom TV serial "Taarak Mehta Ka Ooltah Chashmah".  Her title role of Saroj in Star Plus serial "Bhabhi" made her a popular face in Indian television.

Gajendra Singh: Gajendra Singh is an Indian television producer and director.  His most popular shows include Close-Up Antakshari, SaReGaMa and the recent Amul Music ka Maha Muqqabla and Sur Kshetra.  He grew with Zee TV and took Indian Television to an international level.  He appeared in "Limca book of Records" for making the longest running musical reality show "Antakshari" on Indian Television diaspora for 10 continuous years.  This was followed by 'Sa Re Ga Ma' another longest running show along with the programs like India's Best Cinestar's ki Khoj and Lil' Champs.

Supporting paragraphs: Ghanashyam Nayak Taarak Mehta Ka Ooltah Chashmah
Answer: Natwarlal Prabhashankar Undhaiwala