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
[{'content': "Killian's incision is used for - \nSelect and explain. \nA. Submucous resection of nasal septum, B. Intranasal antrostomy, C. Caldwell-Luc operation, D. Myringoplasty", 'role': 'user'}, {'content': 'Answer: A \nExplanation: "The incision used for submucous resection is known as Killian\'s incision, whereas that used for septoplasty (at the\xa0free margin of the quadrangular cartilage) is Freer\'s incision".\xa0─Essential otolaryngology.', 'role': 'assistant'}]