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': 'All of the following soft tissue sarcoma has propensity for lymphatic spread except \nSelect and explain. \nA. Neurofibrosarcoma, B. Synol sarcoma, C. Rhabdomyosarcoma, D. Epitheloid sarcoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Neurofibrosarcoma Soft tissue sarcomas are tumors of mesenchymal origin. Unlike most carcinomas, soft tissue sarcomas rarely metastasize to the lymph nodes (<5%); therefore lymph node surgery usually is not necessary.", 'role': 'assistant'}]