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: Several viruses can lead to viral pneumonia, including:

Adenoviruses, which can also cause the common cold and bronchitis.
Chickenpox (Varicella-zoster virus).
Flu (influenza viruses).
Respiratory syncytial virus, which causes cold-like symptoms.
Cytomegalovirus, measles, retrovirus.

Mumps is an acute infectious disease of children, characterized by acute, nonsuppurative, painful swelling of the salivary glands, caused by mumps virus.
 
Parija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page:519