Neyveli is the coal mine (lignite) located in Tamil Nadu. It has principal lignite reserves and is used for generation of electricity.
Source: Conventional Sources of Energy, Chapter 5
For map-skill questions, examiners expect you to correctly identify and name the specific location. Here, the key fact is that Neyveli in Tamil Nadu contains lignite (low-grade brown coal) reserves — not bituminous or anthracite. Write the name clearly on the map and, if space allows, add that it is a lignite/brown coal reserve. Do not confuse it with Gondwana coalfields (Jharia, Raniganj) which are in the Damodar Valley.