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
Diagnosis in a 10 year old boy with reccurent 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: Reccurent epistaxis in a 10 year old boy with unilateral nasal mass is diagnostic of juvenile nasopharyngeal fibroma. Ref Dhingra 6/e,p 246.