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 the only complete cailage ring in the respiratory tree? 
Select and explain. 
A. Cricoid cailage, B. Thyroid cailage, C. Cunieform cailage, D. Epiglottis
A: Cricoid cailage
Answer: A: Cricoid cailage 
Explanation: Answer- A (Cricoid cailage)(Ref: BDC 5/e Vol lII/p238)Complete cailage ring is seen in Cricoid cailage.Cricoid cailage is shaped like a ring. It encircles the larynx below the thyroid cailage. It is thicker and stronger than the thyroid cailage.