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
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: Ref:Park's Textbook of Community Medicine 25th Ed