This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
Paralysis of recurrent laryngeal nerve does not affect function of: 
Select and explain. 
A. Thyroarytenoid, B. Lateral cricoarytenoid, C. Vocalis, D. Cricothyroid
D: Cricothyroid
Answer: D: Cricothyroid 
Explanation: Cricothyroid muscle which lies outside the larynx is supplied by external laryngeal nerve - a branch of superior laryngeal nerve of vagus. This is the only laryngeal muscle not supplied by recurrent laryngeal nerve.