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
All of the viruses cause pneumonia except - 
Select and explain. 
A. Cytomegalovirus, B. Mumps, C. Measles, D. Retrovirus
B: Mumps
Answer: B: Mumps 
Explanation: None