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: ENT
[{'content': 'Which of the following laryngeal muscle act as an abductor of vocal cord? \nSelect and explain. \nA. Lateral cricoarytenoid, B. Posterior cricoarytenoid, C. Cricothyroid, D. Aryepiglotticus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Posterior cricoarytenoid muscle is the main abductor of the vocal cord. It is located on the dorsal surface of posterior lamina of the cricoid. The adductors of larynx are thyroarytenoid muscle, lateral cricoarytenoid muscle, and interarytenoid muscle. Muscle Nerve Adductors (lateral crico arytenoid, thyroarytenoid, interarytenoids) Recurrent laryngeal nerve Posterior cricoarytenoid Recurrent laryngeal nerve Cricothyroid External laryngeal nerve', 'role': 'assistant'}]