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: Radiology
Onion peel appearance is more characteristic of 
Select and explain. 
A. Osteosarcoma, B. Osteoclastoma, C. Ewings sarcoma, D. Metastasis
C: Ewings sarcoma
Answer: C: Ewings sarcoma 
Explanation: Onion peel appearance is a periosteal reaction more characteristic of Ewing's sarcoma.