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
[{'content': 'Infection in renal transplant patient is usually caused by - \nSelect and explain. \nA. CMV, B. HIV, C. Herpes, D. Salmonella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]