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: Medicine
[{'content': 'A Child with kidney transplant developed lymphoproliferative cancer. The most common virus implicated is: \nSelect and explain. \nA. CMV, B. Varicella, C. HPV, D. EBV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (EBV): The most common virus implicated in Post-Transplant-Lymphoprohftrative-Disorder (PTLD) is Epstein Barr Virus (EB V). Post-Transplant Lymphoproliferative Disease (PTLD) is a well-recognized complication of both solid organ transplantation (SOT) and allogeneic hematopoietic stem cell transplantation (HSCT). It is one of the most common post-transplant malignancies. In most cases, PTLD is associated with Epstein-Barr virus.(EBV) infection of B cells, either as a consequence of reactivation of the virus post-transplantation or from primary EBV infection. In cases of primary infection, EBV may be acquired from the donor graft or, less commonly, from environmental exposure.', 'role': 'assistant'}]