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? 
Select and explain. 
A. Posterior cricoarytenoid, B. Cricothyroid, C. Interarytenoid, D. Lateral cricoaretynoid
A: Posterior cricoarytenoid
Answer: A: Posterior cricoarytenoid 
Explanation: The posterior cricoarytenoid is the only abductor of the vocal cords. The major abductors of the vocal cords are the lateral cricoarytenoid, thyroarytenoid, and arytenoideus muscles.