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': 'A pt. presented with renal cell carcinoma invadvin IVC and the renal vein. False statement is: \nSelect and explain. \nA. Preop biopsy is not necessary, B. IVC involvement indicates inoperability, C. Pre op radiotherapy is not essential, D. Chest x-ray should be done to rule out pulmonary metastasis.', 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (IVC involvement indicates inoperability): Extension of tumor into IVC does not indicate inoperability. 'Extension into renal vein or inferior vena cava does not preclude resection even if cardiopulmonary bypass is required. Half of these patients have prolonged survival' - Harrison", 'role': 'assistant'}]