This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
Variant of Giant cell tumor is 
Select and explain. 
A. Ossifying fibroma, B. Non Ossifying fivroma, C. Osteosarcoma, D. Chondtoblastoma
D: Chondtoblastoma
Answer: D: Chondtoblastoma 
Explanation: GCT is adult counterpa of chondroblastoma. Chondroblastoma is an epiphyseal tumor which occurs in 2nd decade while GCT is an epiphyseal tumor which occurs in adults Refer https ://emedicine. Medscape.com/aicle/125449-overview