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 muscle is an abductor of the vocal cords: 
Select and explain. 
A. Oblique Arytenoid, B. Transverse Arytenoid, C. Lateral Thyroarytenoid, D. Posterior Cricoarytenoid
D: Posterior Cricoarytenoid
Answer: D: Posterior Cricoarytenoid 
Explanation: Muscle which abduct the vocal cord is posterior cricoarytenoid only