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': 'Nasopharyngeal angiofibroma is: \nSelect and explain. \nA. Benign, B. Malignant, C. Benign but potentially malignant, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nasopharyngeal fibroma is the most common benign tumor of nasopharynx. Most common site is posterior pa of nasal cavity close to the margin of Sphenopalatine foramen. Though it is a benign tumor, it is locally invasive and destroys the adjoining structures. Juvenine Angiofibroma is uncommon, benign and extremely vascular tumor that arises in the tissues within the sphenopalatine foramen.', 'role': 'assistant'}]