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': 'External branch of superior laryngeal nerve supply: \nSelect and explain. \nA. Cricothyroid, B. Thyroarytenoid, C. Posterior cricoarytenoid, D. Cricoarytenoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Right recurrent laryngeal nerve may be superﬁcial or deep to the inferior thyroid artery.\nOccasionally,\xa0some branches are superﬁcial & some are deep.\nLeft recurrent laryngeal nerve is usually deep to inferior\xa0thyroid artery.', 'role': 'assistant'}]