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': 'Quadrilateral cailage is attached to all except \nSelect and explain. \nA. Ethmoid, B. Vomer, C. Sphenoid, D. Maxilla', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C Sphenoid Quadrilateral cailage forms the nasal septum. It is bounded firmly by collagenous fibers to the Nasal bones Ethmoid Vomer Maxilla', 'role': 'assistant'}]