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
Which of the following is the most common retro peritoneal sarcoma ? 
Select and explain. 
A. Liposarcoma, B. Leomyo sarcoma, C. Fibrosarcoma, D. Neural sheath sarcoma
A: Liposarcoma
Answer: A: Liposarcoma 
Explanation: Retroperitoneal sarcomas account for 0.1%-0.2% of all malignant tumours and about 15% of all sarcomas. Liposarcoma is the most common type of retroperitoneal sarcoma (41%), followed by leiomyosarcoma, malignant fibrous histiocytoma, fibrosarcoma and other undifferentiated sarcomas