This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Most common disease caused by CMV in post-bone-marrow transplant patients - \nSelect and explain. \nA. Pyelonephritis, B. Meningitis, C. Pneumonia, D. Gl ulceration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pneumonia is the most common disease caused by CMV in post-bone-marrow transplant patients -', 'role': 'assistant'}]