The largest tiger reserve in India is Nagarjunsagar tiger reserve located in Srisalam. Governed by Project Tiger, administrated by the National Tiger Conservation Authority (NTCA), there are 50 tiger reserves in India. 70 percent of the world's tigers are in India. The Tigers are maintained for their scientific, economic, aesthetic, cultural and ecological values.
So, the correct answer is 'Nagarjunsagar - Srisalam'.