This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
The WHO announced, immunisation is a primary responsibility of - 
Select and explain. 
A. States, B. International community, C. Voluntary agencies, D. An individual
A: States
Answer: A: States 
Explanation: Ans. is 'a' i.e., States