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 neoplasm in HIV patient ? 
Select and explain. 
A. Meduloblastoma, B. Astrocytoma, C. Primary CNS lymphoma, D. Ependymoma
C: Primary CNS lymphoma
Answer: C: Primary CNS lymphoma 
Explanation: Ans. is `c' i.e., Primary CNS lymphoma o Primary CNS lymphoma accounts for 2% of extranodal lymphomas and 1% of intracranial tumors. o It is the most common CNS neoplasm in immunosuppressed patients, including those with AIDS and immunosuppression after transplantation.