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
Smallpox vaccine was discovered by: 
Select and explain. 
A. Edward Jenner, B. Louis pasteur, C. Salk, D. Sabin
A: Edward Jenner
Answer: A: Edward Jenner 
Explanation: Ans: a (Edward Jenner) Ref:Ananthanarayan, ed, p. 457Early live vaccine such as Jenner's pox vaccine, were developed emperically from natural viruses.Sabin's name is related to oral polio vaccine.Salk's name is related to killed polio vaccine.This is a question based on historic importance.