This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': "All are malignant tumors except \nSelect and explain. \nA. Chloroma, B. Fibromatosis, C. Askin's tumor, D. Liposarcoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Robbins 7/p770; Harrison 16/e p633;9/e p1221_1222 Fibromatosis are a group of fibroblastic proliferation through they are locally aggressive, they do not metastasize superficial and deep fibromatosis Plamar ,plantar,penial fibromatosis are superficial type,', 'role': 'assistant'}]