This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
The last case of small pox was repoed in the world 
Select and explain. 
A. 1977, B. 1978, C. 1979, D. 1982
A: 1977
Answer: A: 1977 
Explanation: The eradication of smallpox was confirmed in April 1977 by an international commission. Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 153