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': 'FESS Mean: \nSelect and explain. \nA. Factual endoscopic sinus surgery, B. Functional endonasal sinus surgery, C. Factual endonasal sinus surgery, D. Functional endoscopic sinus surgery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: FESS - Functional endoscopic sinus surgery Ref: Dhingra 7e pg 477', 'role': 'assistant'}]