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': 'Treatment of choice in bilateral ethmoidal polyp is \nSelect and explain. \nA. Ethmoidectomy, B. FESS, C. Endoscopic removal, D. Chemotherapy and Radiotherapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref : Dhingra 7e pg 195.', 'role': 'assistant'}]