This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic and operative ENT, Subject name: ENT
Which of the following is the first step in functional endoscopic sinus surgery 
Select and explain. 
A. Opening of bulla ethmoidalis, B. Unicinectomy, C. Middle meatal antrostomy, D. Middle turbinectomy
B: Unicinectomy
Answer: B: Unicinectomy 
Explanation: Definitive surgical steps include- 1. Unicectomy- Unicinectomy is done to expose the sinus opening within the middle meatus properly Uncinate process is incised with sickle knife and removed with Blakesley forceps. 2. Identification and enlargement of maxillary ostium. 3. Bullectomy. 4. Penetration of lamella and removal of posterior ethmoid cells. 5. Clearance of frontal recess and frontal sinusotomy. 6. Sphenoidotomy. 7. Nasal packs. Ref: Dhingra 7e pg 478.