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: Radiology
[{'content': 'Most common cause of punched out lesions in phalanges is: \nSelect and explain. \nA. Enchondroma, B. Chondrosarcoma, C. Aneurysmal bone cyst, D. Multiple myeloma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Enchondroma', 'role': 'assistant'}]