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
FESS Mean: 
Select and explain. 
A. Factual endoscopic sinus surgery, B. Functional endonasal sinus surgery, C. Factual endonasal sinus surgery, D. Functional endoscopic sinus surgery
D: Functional endoscopic sinus surgery
Answer: D: Functional endoscopic sinus surgery 
Explanation: FESS - Functional endoscopic sinus surgery Ref: Dhingra 7e pg 477