Perumal Murugan is a renowned Indian author and novelist, writing primarily in Tamil.
He is celebrated for his realistic portrayal of rural Tamil Nadu, caste issues, and social traditions.
His well-known works include {One Part Woman (Madhorubhagan)}, {Seasons of the Palm}, and {Poonachi}.
He has received critical acclaim and several awards, including recognition by the Sahitya Akademi.
He is not associated with painting, acting, directing, or journalism — his primary and acclaimed identity is as a writer.
Hence, the correct answer is:
\[
\boxed{\text{Writer}}
\]