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
Which of the following tumor causes polycythemia due to increased erythropoietin production? 
Select and explain. 
A. Cerebellar hemangioblastoma, B. Medulloblastoma, C. Ependymoma, D. Oligodendroglioma
A: Cerebellar hemangioblastoma
Answer: A: Cerebellar hemangioblastoma 
Explanation: Secondary erythrocytosis involves increased erythropoietin (EPO) signalling in the bone marrow. Several types of neoplasm are known to produce excess EPO, including renal cell carcinoma, uterine fibroids, hemangioblastoma, and hepatocellular carcinoma. EPO production can also be increased following renal transplant Ref: Verhovsek M., McFarlane A. (2012). Chapter 173. Abnormalities in Red Blood Cells. In G.V. Lawry, S.C. McKean, J. Matloff, J.J. Ross, D.D. Dressler, D.J. Brotman, J.S. Ginsberg (Eds), Principles and Practice of Hospital Medicine.