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': 'Child with kidney transplant developed lympho-proliferative cancer. This is due to which viral infection - \nSelect and explain. \nA. CMV, B. Varicella, C. HPV, D. EBV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]