This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
[{'content': 'The tumor causing polycythemia due to erythropoietin production is - \nSelect and explain. \nA. Cerebellar hemangioma, B. Medulloblastoma, C. Ependymoma, D. Ougodendroglioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p>The tumors causing inappropriate rise in erythropoietin are renal cell caarcinoma,hepatocellular carcinoma ,cerebellar hemangioblastoma.</p><p>Reference :Harsh mohan textbook of pathology sixth edition pg no 359.</p>', 'role': 'assistant'}]