Tatipaka Oil Refinery is located in the State of

The correct answer is D) Andhra Pradesh. Tatipaka is an ONGC oil field in the East Godavari district, and the small crude processing unit there is a mini refinery that handles crude from local fields. Its low capacity is why it gets less attention than the big refineries.

Why the others are wrong:

• Assam: Digboi (IOCL) is Asia's oldest operating refinery, and Numaligarh (NRL) is the other major one. Both are famous, which is why Assam is the most common wrong pick.
• Uttar Pradesh: Mathura (IOCL) is the state's major refinery, but it is not Tatipaka.
• Karnataka: Mangaluru (MRPL) is the state's refinery, a frequent confusion because of its scale and coastal location.

The core concept is the location-matching of refineries and oil fields, with ONGC's onshore assets in the Krishna-Godavari basin. For Mains, it fits well into questions on energy security and the distribution of hydrocarbon infrastructure.

Trap: Matching a name to the most famous refinery in the country instead of the actual location of the unit.