This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: viral infection, Subject name: Medicine
[{'content': 'Most common virus leading to post transplantation lymphoma is? \nSelect and explain. \nA. EBV, B. CMV, C. Herpes, D. Aspergillus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MC virus leading to post transplantation lymphoma - EBV MC virus leading to Graft Failure in Post kidney transplantation - CMV', 'role': 'assistant'}]