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: Microbiology
[{'content': 'Which virus cause nephropathy in transplant recipients? \nSelect and explain. \nA. Jc virus, B. Bk virus, C. SV - 40 virus, D. Merkel cell virus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bk virus caue nephropathy in tranplant recipients.', 'role': 'assistant'}]