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
Smallpox vaccine was introduced by: 
Select and explain. 
A. Paul Ehrlich, B. Robert Koch, C. Louis Pasteur, D. Edward Jenner
D: Edward Jenner
Answer: D: Edward Jenner 
Explanation: Ans. (d) Edward Jenner* Edward Jenner discovered Smallpox vaccine in 1796- Smallpox vaccine was the 'First Vaccine' to be dis- covered- Smallpox is the 'First and Only' disease to be eradicated - Term 'Vaccination' was coined by Edward JennerALSO REMEMBER* Paul Ehrlich coined terms 'Chemotherapy' and 'Auto-immunity' and giving 'Magic Bullet for Syphilis- Salvarsan'