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: ENT
[{'content': 'Diagnosis in a ten-year-old boy with recurrent epistaxis and a unilateral nasal mass is- \nSelect and explain. \nA. Antrochoanal polyp, B. Hemangioma, C. Angiofibroma, D. Rhinolith', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]