Which of the following diseases is caused by a virus?

مندرجہ ذیل میں سے کون سی بیماری وائرس کی وجہ سے ہوتی ہے؟

Tuberculosis

Malaria

Smallpox

None of these

Smallpox is caused by the variola virus.

It was a contagious and deadly disease until it was eradicated globally through vaccination by 1980.