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: Unknown
Which of the following is true about an antrochoanal polyp? 
Select and explain. 
A. Common in adults, B. Commonly Singular, C. Commonly bilateral, D. Is usually allergic
B: Commonly Singular
Answer: B: Commonly Singular 
Explanation: Ans. is 'b' i.e., Commonly Singular Antrochoanal PoIvdEthmoidal PolypCommon in childrenCommon in adultsInfectionAllergySolitaryMultipleUnilateralBilateralMaxillary sinus near the ostiumEthmoidal sinuses, uncinate process, middle turbinate and middle meatusGrows backward to the choanaMostly grow anteriorly and may present at the naresPolypectomy; endoscopic removal orPolypectomyCaldwell-Luc operation if recurrentEndoscopic surgery or ethmoidectomy (Which may be intranasal, extranasal or transantral)