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
The mucoperichondrial flap in septoplasty is made on 
Select and explain. 
A. Alar cailage, B. Septal cailage, C. Maxilary spine, D. Sphenoidal spine
B: Septal cailage
Answer: B: Septal cailage 
Explanation: The mucoperichondrial flap is elevated on one side over the quadrangular septal cailage.Indication for surgery in DNS- Symptomatic DNS- nasal obstruction, epistaxis, headache, recurrent sinusitis.In SMR, the mucoperichondrial flap is elevated on both the sides of the septal cailage.Incision- Freer`s incision in septoplasty, Killian`s in SMR.Ref: Hazarika; 3rd ed; Page no: 283