Bharat Heavy Electricals Ltd. (BHEL) is a public sector enterprise under the Ministry of Heavy Industries, not the Ministry of Defence. It manufactures power generation and transmission equipment, not defense-related products. The other three options - Bharat Dynamics Ltd (missiles), Mishra Dhatu Nigam (specialty metals for defense), and Bharat Earth Movers Ltd (defense and mining equipment) - are all defense PSUs under the Defence Production Department.