Assertion: India did not sign Non-Proliferation Treaty (NPT)
Reason: India always considered Non-Proliferation Treaty (NPT) as discriminatory in nature.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

During the 1970s, a significant milestone was India's inaugural nuclear explosion in May 1974. Embracing science and technology for modernization, Nehru initiated a nuclear program in the late 1940s led by Homi J. Bhabha, aiming to generate atomic energy for peaceful purposes. Despite advocating nuclear disarmament, global nuclear arsenals increased. After China's 1964 nuclear tests, the five nuclear powers attempted to impose the 1968 Nuclear Non-proliferation Treaty (NPT) on the world, which India deemed discriminatory and rejected.