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: Pathology
[{'content': 'Most common CNS neoplasma in HIV patient 2 \nSelect and explain. \nA. Medulloblastoma, B. Ependymoma, C. Astrocytoma, D. Primary CNS lymphoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Primary CNS lymphoma occurs very frequently in patients suffering AIDS and others immuno deficiency states.', 'role': 'assistant'}]