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
[{'content': 'Polycythemia is not caused by ? \nSelect and explain. \nA. Renal carcinoma, B. Liver carcinoma, C. Cerebellar hemangioma, D. Lung carcinoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Lung carcinoma Impoant tumors causing polycythemia are renal cell carcinoma, hepatocellular carcinoma (liver carcinoma) and cerebellar hemangioma.", 'role': 'assistant'}]