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': 'An antrochoanal polyp is associated most commonly with? \nSelect and explain. \nA. Superior meatus, B. Inferior meatus, C. Middle meatus, D. Sphenoethmoidal recess', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Antrochoanal polyp arises from the mucosa of the maxillary antrum near its accessory ostium, comes out of it and grows in the choana and nasal cavity. Hyperophied middle turbinate, one of the impoant differential diagnosis, which is differentiated by its pink appearance and hard feel of the bone on probe testing. Antrochoanal polyps are most commonly associated with middle meatus. (Ref - PL DHINGRA diseases of ear nose and throat, 7th edition, page no 193)', 'role': 'assistant'}]