Name India's oldest nuclear reactor which was recommissioned in 2018.

Correct option is D

• Apsara is India's oldest nuclear reactor, which was first commissioned in 1956 at the Bhabha Atomic Research Centre (BARC) in Mumbai.
• It was India's first nuclear reactor and played a significant role in India's nuclear research program.
• The reactor was recommissioned in 2018 after undergoing significant refurbishment to continue its research work in nuclear science and technology.

• Dhruva: A research reactor at BARC, used for isotope production and nuclear research.
• Dhanush: Refers to a missile system developed by India, not a nuclear reactor.
• Bhaskar: Refers to an Indian satellite program, not a nuclear reactor.