This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunodeficiency Disorders, Subject name: Pathology
[{'content': 'Perivascular lymphocytic and microglial nodules are seen in \nSelect and explain. \nA. Multiple sclerosis, B. HIV encephalitis, C. Bacterial meningitis, D. CMV encephalitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HIV encephalitis Chronic inflammatory reaction characterized by widely distributed microglial nodules, often containing macrophage-derived multinucleated giant cells; foci of tissue necrosis . Reactive gliosis are sometimes seen together with these lesions. Microglial nodules found near small blood vessels, show abnormally prominent endothelial cells and perivascular foamy or pigment-laden macrophages.', 'role': 'assistant'}]