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
[{'content': 'Abductor of larynx is \nSelect and explain. \nA. Cricothyroid, B. Posterior cricoarytenoid, C. Thyro arytenoid, D. Lateral cricoarytenoid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]