This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'Primary cerebral lymphoma - \nSelect and explain. \nA. It is most common formed of T cells, B. It is usually solitary, C. Multifocal-lesion are seen, D. It is seen in immunosuppressed patient', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Primary CNS lymphoma are high grade B cell lymphomas associated with EBV infection .Characteristically ,imaging shows a single,homogenously enhancing ,periventricular lesion with surrounding oedema.Brain biopsy is definitive.Prognosis is very poor. Reference: Harrison20th edition pg 897', 'role': 'assistant'}]