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
All are malignant tumors except 
Select and explain. 
A. Chloroma, B. Fibromatosis, C. Askin's tumor, D. Liposarcoma
B: Fibromatosis
Answer: B: Fibromatosis 
Explanation: 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,