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
External branch of superior laryngeal nerve supply: 
Select and explain. 
A. Cricothyroid, B. Thyroarytenoid, C. Posterior cricoarytenoid, D. Cricoarytenoid
A: Cricothyroid
Answer: A: Cricothyroid 
Explanation: Right recurrent laryngeal nerve may be superﬁcial or deep to the inferior thyroid artery.
Occasionally, some branches are superﬁcial & some are deep.
Left recurrent laryngeal nerve is usually deep to inferior thyroid artery.