Match List-I with List-II and select the correct answer by using the codes given below the lists: List-I (Industry) A) Paper B) Cement C) Iron & steel D) Mineral Oil Refinery List-II (Place) 1) Ambalamugal 2) Bhilai 3) Titagarh 4) Lakeri

The correct answer is B, which gives A-3, B-4, C-2, D-1. Anchor each industry to its state and the matching becomes straightforward.

• Paper (A) with Titagarh (3): Titagarh in West Bengal, near Kolkata, is a long-established paper mill centre.
• Cement (B) with Lakeri (4): Lakheri in Bundi district, Rajasthan, hosts a cement works, a limestone-based industry tied to the Vindhyan belt.
• Iron and steel (C) with Bhilai (2): Bhilai Steel Plant in Chhattisgarh was set up with Soviet collaboration and commissioned in the late 1950s, one of the three public-sector integrated steel plants of the Second Plan era.
• Mineral oil refinery (D) with Ambalamugal (1): Ambalamugal in Ernakulam district, Kerala, houses the Kochi refinery, now run by BPCL.

The core concept is the location of industries near raw materials, markets and transport. This links directly to Mains GS-3 questions on industrial location and regional development.

Trap: Aspirants try to match Paper with a Kerala place because Kerala's forest and paper links feel familiar. Anchor each place to its state first and the answer follows.