Question: Pulan Visaranai is a 1990 Tamil language film directed by R. K. Selvamani, the  character of the antagonist Dharma (played by Anandaraj) is loosely based on which serial killer, what's the nickname of Indian serial killer Gowri Shankar?
Sentence (from "Pulan Visaranai"): The film was a blockbuster and was considered to be one of the best crime thrillers of its time.
Relevant evidence: No