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
Most common CNS neoplasma in HIV patient 2 
Select and explain. 
A. Medulloblastoma, B. Ependymoma, C. Astrocytoma, D. Primary CNS lymphoma
D: Primary CNS lymphoma
Answer: D: Primary CNS lymphoma 
Explanation: Primary CNS lymphoma occurs very frequently in patients suffering AIDS and others immuno deficiency states.