This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Abductor of larynx is 
Select and explain. 
A. Cricothyroid, B. Posterior cricoarytenoid, C. Thyro arytenoid, D. Lateral cricoarytenoid
B: Posterior cricoarytenoid
Answer: B: Posterior cricoarytenoid 
Explanation: movements and muscles Elevation of larynx; thyrohyoid, mylohyoid Depression of larynx; sternothyroid, sternohyoid Opening inlet of larynx; thyroepiglottic Closing inlet of larynx: aryepiglottic Abductor of vocal cords: posterior cricoarytenoid only Adductor of vocal cords: lateral cricoarytenoid transverse and oblique arytenoids Ref BDC volume 3,sixth edition