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
Vaccine which is eradicated worldwide is - 
Select and explain. 
A. Small pox, B. Polio, C. Measles, D. Diphtheria
A: Small pox
Answer: A: Small pox 
Explanation: Small pox is eradicated worldwide, so no vaccine. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 132