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
WHO surveillance is done for all, except- 
Select and explain. 
A. Polio, B. Viral encephalitis, C. Malaria, D. Relapsing fever
B: Viral encephalitis
Answer: B: Viral encephalitis 
Explanation: Ans. is 'b' i.e., Viral encephalitis