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: Medicine
[{'content': 'Which among the following tumor is associated with Polycythemia vera? \nSelect and explain. \nA. Osteosarcoma, B. Ovarian tumor, C. Cerebellar haemangioblastoma, D. Pitutary adenoma', 'role': 'user'}, {'content': "Answer: C \nExplanation: Tumors associated with polycythemia vera are Hypernephroma, Hepatoma, Cerebellar hemangioblastoma, Uterine myoma, Adrenal tumors, Meningioma, Pheochromocytoma. The JAK2 gene located on the sho arm of chromosome 9 and loss of heterozygosity on chromosome 9p due to mitotic recombination is the most common cytogenetic abnormality in Polycythemia Vera. Ref: Harrison's Internal Medicine, 18th Edition, Pages 898-900", 'role': 'assistant'}]