This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Diseases of Larynx, Subject name: ENT
[{'content': 'Abductor of vocal cord is: \nSelect and explain. \nA. Posterior cricoarytenoid, B. Lateral cricoarytenoid, C. Cricothyroid, D. Thyroarytenoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The Posterior cricoarytenoid is the only abductor of the true vocal cord.', 'role': 'assistant'}]