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
Which of the following is formed of elastic cailage? 
Select and explain. 
A. Auditory tube, B. Nasal septum, C. Aicular cailage, D. Costal cailage
A: Auditory tube
Answer: A: Auditory tube 
Explanation: Auditory tubeREF: Basic histology, Carlos & Jose, 11th edition, Chapter 7, Cailage, Textbook of human histology 4th e p. 92-94