Multiple choice general knowledge The refineries are Mathura, Digboi and Panipat are set up by Hindustan Petroleum Corporation Ltd. Bharat Petroleum Corporation Ltd. Crude Distillation unit of Madras Refineries Ltd. Indian Oil Corporation Ltd. Reveal answer Fill a bubble to check yourself D Correct answer Explanation The refineries at Mathura (Uttar Pradesh), Digboi (Assam), and Panipat (Haryana) are all owned and operated by the Indian Oil Corporation Limited (IOCL), India's largest state-owned oil and gas corporation.