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
Osteosarcoma commonly affects: September 2005 
Select and explain. 
A. Metaphysis, B. Diaphysis, C. Epiphysis, D. None of the above
A: Metaphysis
Answer: A: Metaphysis 
Explanation: Ans. A: Metaphysis Metaphysis-common site for osteosarcoma Diachysis- common site for ewing's tumor Epiphysis- common site for osteoclastoma