This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'Symptoms from a retroperitoneal sarcoma are usually produced by \nSelect and explain. \nA. Bleeding into the tumor mass, B. Compression of adjacent tissues, C. Invasion of retroperitoneal organs, D. Metastases to retroperitoneal lymph nodes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Retroperitoneal sarcomas grow along fascial planes and envelop rather than invade retroperitoneal organs.vLymph node metastases are unusual. The tumor does not usually grow rapidly enough to outgrow its blood supply, and major hemorrhage into the tumor mass is uncommon.', 'role': 'assistant'}]