<prompt> Which among the following tumor is associated with Polycythemia vera?OsteosarcomaOvarian tumorCerebellar haemangioblastomaPitutary adenoma  <response>: 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: Harrisons Internal Medicine, 18th Edition, Pages 898-900 