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: Surgery
[{'content': 'A 70 year old male known case of a ceain malignancy presents with elevated erythropoietin levels and PCV of 52%. Most likely tumour is \nSelect and explain. \nA. Renal Cell Carcinoma, B. Medullary thyroid carcinoma, C. Gastric Carcinoma, D. Colorectal CA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Renal Cell CarcinomaErythrocytosis (d/t secretion of erythropoietin by RCC) (but anemia is a more common finding)HypeensionAbnormal liver function (Stauffers syndrome ie non metastatic hepatic dysfunction)HypercalcemiaNeuromyopathyAmyloidosisIncreased ESR (MC paraneoplastic syndrome)DysfibrogenemiaGalactorrhoeaFeminization and masculanization', 'role': 'assistant'}]