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: Surgery
Infection in renal transplant patient is usually caused by ? 
Select and explain. 
A. CMV, B. HIV, C. Herpes, D. Salmonella
A: CMV
Answer: A: CMV 
Explanation: Ans. is 'a' i.e., CMV