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
Small pox vaccine was invented by 
Select and explain. 
A. Louis pasture, B. Edward Jenner, C. Paul Eugene, D. John snow
B: Edward Jenner
Answer: B: Edward Jenner 
Explanation: Small pox vaccine Introduced by Edward Jenner in 1796, was the first successful vaccine to be developed Ref : Park's Textbook of Preventive and Social Medicine; 23rd edition