Which constitutional body is known as a watchdog of Indian revenues?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → CAG
The Comptroller and Auditor General of India (CAG), set up under Article 148, audits all receipts and spending of the Union and state governments and reports to Parliament and the state legislatures. Because it guards public money, it is called the watchdog of the public purse (of Indian revenues).
Why the other options are incorrect
Option (1) NITI Aayog — Incorrect. It is the government's policy think tank, set up by an executive resolution in 2015, not a constitutional body.
Option (2) Finance Commission — Incorrect. A constitutional body (Article 280) that recommends how taxes are shared between the Union and the states; it does not audit.
Option (4) Central Vigilance Commission — Incorrect. A statutory body that checks corruption among Union government officials.