The correct answer is 1967.
Nagarjuna Sagar Dam is built across the Krishna River, on the border of Telangana and Andhra Pradesh. Construction began in 1955 and the dam was completed in 1967.
It is one of the largest masonry dams in the world and was named after the ancient Buddhist scholar Acharya Nagarjuna. The dam supplies water for irrigation to a large area and also generates hydroelectric power.