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
Emergency or reemergence seen in which of the following organisms -a)  Polio virusb)  Measles virusc)  Nipah virusd)  West Nile viruse)  Hepatitis B virus 
Select and explain. 
A. abd, B. cde, C. bde, D. ade
B: cde
Answer: B: cde 
Explanation: None