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
The following muscle is an opener of the glottis - 
Select and explain. 
A. Lateral cricoarytenoid, B. Posterior cricoarytenoid, C. Transverse arytenoid, D. Inter arytenoids
B: Posterior cricoarytenoid
Answer: B: Posterior cricoarytenoid 
Explanation: Opener (abductor) of glottis is posterior cricoarytenoid.