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 expect 
Select and explain. 
A. Polio, B. Viral Encephalitis, C. Malaria, D. Relapsing fever
B: Viral Encephalitis
Answer: B: Viral Encephalitis 
Explanation: Diseases under WHO surveillance Polio Rabies Relapsing fever Influenza Salmonella Malaria Louse born typhus