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: Surgery
Which of the following are also called as "Ghost cell tumors"? 
Select and explain. 
A. Medulloblastoma, B. Acoustic neuroma, C. Primary CNS lymphoma, D. Glioblastoma
C: Primary CNS lymphoma
Answer: C: Primary CNS lymphoma 
Explanation: Primary CNS lymphomas are also called as "Ghost cell tumors" as they show quick resolution after initiation of steroids.