Question: Who was the director of the 1984 film starring Mohanlal Viswanathan Nair?

Context paragraphs:
Uyarangalil: Uyarangalil ("At the Top") is a 1984 Malayalam thriller film directed by I. V. Sasi, written by M.T. Vasudevan Nair, and produced by S. Pavamani; starring Mohanlal, Nedumudi Venu, Rahman, Kajal Kiran, Swapna, and Ratheesh in the lead roles.

Unaru: Unaru (English: "Rise Up" ) is a 1984 Indian Malayalam-language film directed by Mani Ratnam, starring Mohanlal, Sukumaran, Ratheesh, Sabitha Anand, Ashokan and Balan K. Nair.  The film gives the inside view of the problems that arose in the labour trade union parties in Kerala, with music composed by Ilaiyaraaja and cinematography by Ramachandra Babu.

Thazhvaram: Thazhvaram (English: "The Valley") is a 1990 Indian Malayalam Western revenge-thriller film directed by Bharathan and written by M. T. Vasudevan Nair, starring Mohanlal, Salim Ghouse, Anju, Sumalatha, and Sankaradi in the lead roles.  It tells the tale of Balan (Mohanlal) who's on the lookout for revenge against Raju (Salim Ghouse) for the murder of Balan's wife Raji (Anju).

Drishya: Drishya (Kannada: ದೃಶ್ಯ , English: "Visual" ) is a 2014 Indian Kannada language drama thriller film directed by P. Vasu and starring V. Ravichandran and Navya Nair in the lead roles.  It is the remake of the 2013 Malayalam film "Drishyam", directed by Jeethu Joseph and starring Mohanlal and Meena.  The supporting cast feature an ensemble of Achyuth Kumar, Prabhu Ganesan, Asha Sarath, Swaroopini Narayan, Unnathi and Rohith B.

Kalippattam: Kalippattam (English: "Toy") is a 1993 Malayalam film written and directed by Venu Nagavalli and starring Mohanlal, Urvashi, Thilakan, Kaviyoor Ponnamma, Jagathy and Nedumudi Venu.  Mohanlal also sang a song ("Vazhiyoram") with Chithra for the film.  The story is about the love between a violinist played by Mohanlal and a terminally ill girl played by Urvashi.

Olympiyan Anthony Adam: Olympiyan Anthony Adam is a 1999 Indian Malayalam comedy thriller film written and directed by Bhadran, starring Mohanlal, Meena, and Nassar.  It was produced by Mohanlal for Pranavam Arts, and was one of the costliest films made in Malayalam up to that point.  It got a large opening at the box office.  The plot follows an investigation by Chakkummoottil Varghese Antony IPS (Mohanlal) about a planned terrorist attack in India.

The Prince (1996 film): The Prince is a 1996 Malayalam film starring Mohanlal.  It was Tamil director Suresh Krishna's debut in the Malayalam industry and his next venture after the Tamil blockbuster "Baasha".  After three consecutive blockbusters with Tamil superstar Rajinikanth, Suresh Krishna wanted to direct Malayalam superstar Mohanlal, and Mohanlal agreed to do the film.  However, the film was a flop at the box office.  The music was scored by Deva.

Aalkkoottathil Thaniye: Aalkkoottathil Thaniye English: Alone In a Crowd ) is a 1984 Malayalam film directed by I. V. Sasi, written by M. T. Vasudevan Nair, and starring Mammootty, Mohanlal and Seema.

Hariharan Pillai Happy Aanu: Hariharan Pillai Happy Aanu (English translation: "Hariharan Pillai is happy") is a 2003 Malayalam film by Viswanath starring Mohanlal and Jyothirmayi.  This was Viswanathan's debut film as a director and the debut music directorial venture of renowned pianist and arranger, Stephen Devassy.

Mohanlal: Mohanlal Viswanathan Nair (born 21 May 1960), better known as Mohanlal, is an Indian actor, producer and singer best known for his work in Malayalam cinema.

Supporting paragraphs: Aalkkoottathil Thaniye Mohanlal
Answer: I. V. Sasi