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
Which disease doesn't require chemoprophylaxis? 
Select and explain. 
A. Measles, B. Conjunctivitis, C. Cholera, D. Malaria
A: Measles
Answer: A: Measles 
Explanation: Measles prevention is only by immunisation and vaccination. No chemoprophylaxis(Ref.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 21st Edition page no.136)