This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
Safety muscle of larynx is: 
Select and explain. 
A. Aryepiglotticus, B. Cricoarytenoid, C. Thyroarytenoid, D. Posterior cricoarytenoid
D: Posterior cricoarytenoid
Answer: D: Posterior cricoarytenoid 
Explanation: Ans. D Posterior cricoarytenoidRef: Dhingra, 5thpg. 300* Posterior cricoarytenoid is the most important muscle of the larynx as it is the only abductor of vocal cord.* Paralysis of posterior cricoarytenoid will lead to adduction of vocal cord, which may lead to dyspnea resulting in death.