This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'Diagnosis in a 10 year old boy with reccurent 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: Reccurent epistaxis in a 10 year old boy with unilateral nasal mass is diagnostic of juvenile nasopharyngeal fibroma. Ref Dhingra 6/e,p 246.', 'role': 'assistant'}]