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': 'All are true about Antrochoanal polyp, EXCEPT: \nSelect and explain. \nA. Unilateral and single, B. Grows backwards to the choana, C. Avulsion is the treatment of choice, D. Common in children', 'role': 'user'}, {'content': "Answer: C \nExplanation: Antrochoanal polyp are benign lesions that are most commonly seen in children. This isolated polyp has its origin from the mucosa of the maxillary sinus and extend into choana and nasopharynx. The major problem is unilateral nasal obstruction. Treatment of choice is primary endoscopic removal with resection of the basis in the maxillary sinus. Complete removal of the polyp's base is mandatory to prevent a recurrence.", 'role': 'assistant'}]