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 of the following is the abductor of vocal cords? 
Select and explain. 
A. Lateral cricoarytenoid, B. Posterior cricoarytenoid, C. Anterior cricoarytenoid, D. Cricothyroid
B: Posterior cricoarytenoid
Answer: B: Posterior cricoarytenoid 
Explanation: Muscles acting on vocal cords: Abductor of vocal cord: Posterior cricoarytenoid Adductors: Lateral cricoarytenoid, interarytenoid (transverse arytenoid), thyroarytenoid (external pa Tensors: Cricothyroid vocalis (internal pa of thyroarytenoid)