This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Killian's incision is used for - 
Select and explain. 
A. Submucous resection of nasal septum, B. Intranasal antrostomy, C. Caldwell-Luc operation, D. Myringoplasty
A: Submucous resection of nasal septum
Answer: A: Submucous resection of nasal septum 
Explanation: "The incision used for submucous resection is known as Killian's incision, whereas that used for septoplasty (at the free margin of the quadrangular cartilage) is Freer's incision". ─Essential otolaryngology.