Through which Institution, the Government of India maintains the buffer stock of food

The correct answer is (c) FCI.

The Food Corporation of India (FCI) is a statutory corporation of the Government of India under the Ministry of Consumer Affairs, Food and Public Distribution. It is responsible for the procurement, storage, and distribution of food grains in India. The FCI maintains a buffer stock of food grains to ensure that there is no shortage of food in the country.

ONGC is the Oil and Natural Gas Corporation, a state-owned oil and gas company. IDBI is the Industrial Development Bank of India, a state-owned development bank. NMTC is the National Mineral Trading Corporation, a state-owned mineral trading company.