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: Microbiology
Virus which has more than one serotypes ? 
Select and explain. 
A. Measles, B. Mumps, C. Rubella, D. Influenza
C: Rubella
Answer: C: Rubella 
Explanation: Ans. is 'd' i.e., Influenza Influenza virus is an enveloped RNA virus containing 8 pieces (8 segments) of single stranded RNA. There are three viral subtypes : (i) Type A (causes all pandemics and most epidemics); (ii) Type B; and (iii) Type C (not circulating currently).