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: Pathology
'Onion Skin' appearance of radiographs is seen in 
Select and explain. 
A. fibrous dysplasia, B. osteosarcorna, C. Ewing's sarcoma, D. Chondrosarcoma
C: Ewing's sarcoma
Answer: C: Ewing's sarcoma 
Explanation: None