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
Diagnosis in a ten-year-old boy with recurrent epistaxis and a unilateral nasal mass is- 
Select and explain. 
A. Antrochoanal polyp, B. Hemangioma, C. Angiofibroma, D. Rhinolith
C: Angiofibroma
Answer: C: Angiofibroma 
Explanation: None