Largest brackish water lake in India is:

Correct option is B

Correct Answer: (b) Chilka lake
Explanation:
→ Chilka Lake (Odisha) is the largest brackish water lagoon in India and one of the largest in Asia, noted for its fisheries, birdlife and ecological importance.
Information Booster:
→ Chilka supports diverse fishery resources (prawns, mullets, crabs) and seasonal migratory birds (flamingos).
Additional Information (Other Options):
(a) Kerala backwaters are extensive but not larger than Chilka; (c) Pulicat is second largest; (d) Hooghly Matlah is estuarine region, not the largest brackish lake.