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
Epiphyseal arising bone tumor is: 
Select and explain. 
A. Osteod osteoma, B. Chondrosarcoma, C. Ewings sarcoma, D. Chondroblastoma
D: Chondroblastoma
Answer: D: Chondroblastoma 
Explanation: Chondroblastoma