This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nasal Polyposis, Subject name: ENT
[{'content': 'Which of the following best differentiates antrochoanal polyp from ethmoidal polyp? \nSelect and explain. \nA. They are multiple, B. Best seen on posterior rhinoscopy, C. Recurrence on polypectomy, D. They are bilateral', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (b) Best seen on posterior rhinoscopy(Ref. Scott Brown, 6th ed., 4/10/14)EthmoidalAntrochoanalMainly allergic etiologyInfectiveCommonUncommonMiddle ageYoungMultipleSingleBilateralUnilateralSeen on anterior rhinoscopyPosterior rhinoscopySteroids and antihistaminics are used in t/tNo roleHighly recurrentRecurrence is uncommon', 'role': 'assistant'}]