This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
WHO declared that smallpox has been eradicated in 
Select and explain. 
A. Jun-92, B. Dec-00, C. May-80, D. Jan-85
C: May-80
Answer: C: May-80 
Explanation: Smallpox is an acute contagious disease caused by the variola virus, a member of the ohopoxvirus family. It was one of the world&;s most devastating diseases known to humanity. The last known natural case was in Somalia in 1977. It was declared eradicated in 1980 following a global immunization campaign led by the World Health Organization.