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: Anatomy
[{'content': 'All of the following muscles are supplied by recurrent laryngeal nerve except: \nSelect and explain. \nA. Cricothyroid, B. Arytenoid, C. Cricoarytenoid, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nerve Supply of muscles of larynx:\nMotor Nerves\n\nRecurrent laryngeal nerve supplies posterior cricoarytenoid, lateral cricoarytenoid, transverse and oblique arytenoid, aryepiglottic, thyroarytenoid, thyroepiglottic muscles.\xa0\nIt supplies all intrinsic muscles except cricothyroid.\nExternal laryngeal nerve only supplies the cricothyroid muscle.\n\nSensory Nerves\n\nThe internal laryngeal nerve supplies the mucous membrane up to the level of the vocal folds.\xa0\nThe recurrent laryngeal nerve supplies it below the level of the vocal folds.\n\nKey Concept:\xa0\nCricothyroid is supplied by external laryngeal branch of superior laryngeal nerve.', 'role': 'assistant'}]