The correct answer is Atomic energy. Explanation & Key Takeaways: • Post-1991 economic reforms, most industries were deregulated to encourage private sector participation and reduce government control. • Despite these reforms, atomic energy remained reserved for the public sector due to its strategic importance and security considerations. • The Atomic Energy Act, 1962, governs all activities related to atomic energy in India and restricts its operations exclusively to the government. • The Department of Atomic Energy (DAE), under the Government of India, is responsible for the development and regulation of nuclear energy in the country. • The strategic nature of atomic energy ensures its role in defense, space exploration, and energy security, making it critical for national sovereignty. Related Concepts: • 1991 Economic Reforms: • Also known as LPG (Liberalization, Privatization, and Globalization) reforms, these were introduced to address the balance of payments crisis and integrate India into the global economy. • Sectors like banking, telecom, and manufacturing were opened up to private players, both domestic and foreign. • Atomic Energy Act, 1962: • It provides the legal framework for the development, regulation, and control of atomic energy in India. • It prohibits any individual or private entity from engaging in activities related to atomic energy without government authorization. • Department of Atomic Energy (DAE): • Established in 1954, DAE is responsible for research, production, and development of nuclear power and related technologies. • It oversees institutions like the Bhabha Atomic Research Centre (BARC) and Nuclear Power Corporation of India Limited (NPCIL). • Strategic Importance of Atomic Energy: • It plays a key role in national defense, including the development of nuclear weapons and submarines. • Nuclear energy contributes to India’s energy security, providing a clean and sustainable source of power. • Global Context: • India is a signatory to international agreements like the Civil Nuclear Agreement and works with the International Atomic Energy Agency (IAEA) for peaceful use of nuclear technology. • Despite international collaborations, the Indian government retains full control over its nuclear programs for strategic and security reasons.