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
Osteoclastoma usually occurs in? 
Select and explain. 
A. Epiphysis, B. Metaphysis, C. Diaphysis, D. Can occur anywhere
A: Epiphysis
Answer: A: Epiphysis 
Explanation: Giant cell tumor also known as osteoclastoma occurs usually in the epiphysis of long bones. It is benign but locally aggressive.