This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
[{'content': 'Which one of the following benign tumors can metastasize to the lung? \nSelect and explain. \nA. Osteoid osteoma., B. Non-ossifying fibroma., C. Hemangioma., D. Chondroblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. Chondroblastoma.Benign skeletal tumors rarely if ever metastasize to lung. The two exceptions to this rule are giant cell tumor (up to 10% metastasize to lung) and chondroblastoma', 'role': 'assistant'}]