Consider the following diseases : 1. Diphtheria 2. Chickenpox 3. Smallpox Which of the above diseases has/have been eradicated in India?

Smallpox is the only disease among the three that has been officially eradicated in India (declared free in 1977) and globally (1980). Option (c) is incorrect because Diphtheria and Chickenpox remain endemic in India, with Diphtheria still being a major target of the Universal Immunization Programme rather than being eradicated. The core concept tested is the distinction between disease eradication (permanent reduction to zero globally) and disease control or elimination within a specific population.