This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': "A 16-year-old boy complains of difficulty in breathing through his nose. Endoscopy reveals a tumor infiltrating the nasopharynx. Histology reports this as a juvenile nasopharyngeal haemangiofibroma. The boy's anxious mother requests information concerning the lesion. What should she be told? \nSelect and explain. \nA. It is a premalignant lesion., B. It usually occurs with laryngeal obstruction., C. It is treated with radiotherapy., D. It may proceed to destroy surrounding bone.", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Juvenile nasopharyngeal haemangiofibromas are rare nonmalignant tumors containing both fibrous and vascular tissue. They occur exclusively among boys.', 'role': 'assistant'}]