Assertion: Bangladesh was formerly known as East Pakistan and came into being in 1972.
Reason: The crisis in East Pakistan and the Indo-Pak war led to the establishment of Bangladesh.

The Assertion is incorrect but the Reason is correct.

Bangladesh, previously referred to as East Pakistan, emerged as an independent nation in 1971. Prior to this, it was a region situated on the eastern side of Pakistan. The year 1971 marked the culmination of a struggle for autonomy and self-determination, leading to the establishment of Bangladesh as a sovereign country. This transformation was a significant historical event that saw the people of East Pakistan asserting their distinct cultural, linguistic, and political identity, ultimately resulting in the creation of the nation of Bangladesh.