The correct option is A Central National Herbarium, Kolkata
Central National Herbarium is the largest herbarium in South-East Asia. It is situated within the Botanic Garden at Shibpur in Paschim Banga, Kolkata.
Presently, the Central National Herbarium possesses about 2.5 million of herbarium sheets belonging to nearly 350 families of plants, which are arranged according to Bentham and Hooker's system of classification.