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
[{'content': 'All of the viruses cause pneumonia except: \nSelect and explain. \nA. Cytomegalovirus, B. Mumps, C. Measles, D. Retrovirus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Several viruses can lead to viral pneumonia, including:\n\nAdenoviruses, which can also cause the common cold and bronchitis.\nChickenpox (Varicella-zoster virus).\nFlu (influenza viruses).\nRespiratory syncytial virus, which causes cold-like symptoms.\nCytomegalovirus, measles, retrovirus.\n\nMumps is an acute infectious disease of children, characterized by acute, nonsuppurative, painful swelling of the salivary glands, caused by mumps virus.\n\xa0\nParija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page:519', 'role': 'assistant'}]