This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'The commonest systemic abnormality associated with renal cell carcinoma Is - \nSelect and explain. \nA. Hypeension, B. Polycythemia, C. Elevated ESR, D. Pyrexia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The preoperative erythrocyte sedimentation rate is an independent prognostic factor in renal cell carcinoma. An elevated erythrocyte sedimentation rate (ESR) repoedly has been associated with a poor prognosis among patients with RCC, but the ESR is not incorporated into existing nomograms Ref Harrison20th edition pg 288', 'role': 'assistant'}]