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
Most common primary bone tumour of hand is: 
Select and explain. 
A. Osteoma, B. Osteochondroma, C. Enchondroma, D. None of the above
C: Enchondroma
Answer: C: Enchondroma 
Explanation: Enchondromas arise from cailage and are the most common primary bone tumors of the hand. These lesions account for >90% of bone tumors seen in the hand. Ref: Schwaz's principle of surgery 9th edition, chapter 44.