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
Which among the following is the abductor of vocal cord, paralysis of which could lead to suffocation? 
Select and explain. 
A. Posterior cricoarytenoid, B. Cricothyroid, C. Lateral cricoaretynoid, D. Interarytenoid
A: Posterior cricoarytenoid
Answer: A: Posterior cricoarytenoid 
Explanation: Posterior cricoarytenoid is the sole abductor of vocal cords and bilateral paralysis may lead to the adduction of vocal cords and suffocation. The posterior cricoarytenoid muscle causes the muscular process of the arytenoid to be pulled posteriorly and toward the opposite arytenoid. The vocal process, in turn, is pulled laterally, causing the abduction of the vocal cord.