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: Anatomy
Nasal Septum is formed by: 
Select and explain. 
A. Perpedicular plate of ethmoid, B. Crest of maxilla, C. Septal cailage, D. All
D: All
Answer: D: All 
Explanation: B. i.e. Crest of maxilla; C. i.e. Septal cailage; A. i.e. Perpendicular plate of ethmoid