This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification of Bone Tumors, Subject name: Orthopaedics
Which one of the following bone tumors typically affects the epiphysis of a long bone? 
Select and explain. 
A. Osteosarcoma, B. Ewing's sarcoma, C. Chondroblastoma, D. Chondromyxoid fibroma
C: Chondroblastoma
Answer: C: Chondroblastoma 
Explanation: Ans. is 'c' ie chondroblastoma (Ref: Apley's, 8/e, p177).Apley's - "X-Ray shows a rounded, well demarcated radiolucent area in the epiphysis; this site is so unusual that the diagnosis springs readity to mind; However, sometimes the lesion extends across the physeal line".Remember