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
Quadrilateral cartilage is attached to all except - 
Select and explain. 
A. Ethmoid, B. Vomer, C. Sphenoid, D. Maxilla
C: Sphenoid
Answer: C: Sphenoid 
Explanation: Qudrilateral (septal) cartilage is one of the principal constituent of nasal septum.
It is attached to nasal bones, ethmoid bone, vomer, and maxilla.