This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Post renal transplant lymphoma is mostly associated with \nSelect and explain. \nA. EBV, B. CMV, C. Herpes simplex, D. HHV-6', 'role': 'user'}, {'content': 'Answer: A \nExplanation: EBV is a very common virus: about 9 in 10 adults have been infected with it. EBV infects B lymphocytes. Some cases of PTLD are not related to EBV (EBV-negative PTLD). They tend to occur months or years after transplant, when the risk of lymphoma is usually lower than it is in the early months after transplant. Ref Harrison20th edition pg 267', 'role': 'assistant'}]