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
Malignant change in lipoma is most common in ? 
Select and explain. 
A. Thigh, B. Nape of neck, C. Retroperitoneum, D. Back
C: Retroperitoneum
Answer: C: Retroperitoneum 
Explanation: Ans. is 'c' i.e., Retroperitoneum