This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
[{'content': 'Abductor of vocal cord is? \nSelect and explain. \nA. Posterior cricoarytenoid, B. Cricothyroid, C. Interarytenoid, D. Lateral cricoaretynoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) Posterior cricoarytenoidREF: Dhingra 4th ed p. 259Repeat from December 2009, December 2010INTRINSIC MUSCLES ACTING ON VOCAL CORDS:AbductorsPosterior cricoarytenoidAdductorsLateral cricoarytenoid, Lnterarytenoid (transverse arytenoid) Thyroarytenoid (external part)TensorsCricothyroid Vocalis (internal part of thyroarytenoid)INTRINSIC MUSCLES ACTING ON LARYNGEAL INLET:Openers of laryngeal inletThyroepiglottic (part of thyroarytenoid)Closers of larylngeal inletlnterarytenoid (oblique part), Aryepiglottic (posterior oblique part of interarytenoids)', 'role': 'assistant'}]