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
During a thyroid operation, a nerve coursing along with the superior thyroid artery is injured. What can be the possible consequence(s)? 
Select and explain. 
A. Loss of sensation above vocal cord, B. Loss of sensation below vocal cord, C. Paralysis of lateral cricoarytenoid muscle, D. Paralysis of cricothyroid muscle
D: Paralysis of cricothyroid muscle
Answer: D: Paralysis of cricothyroid muscle 
Explanation: The nerve coursing along with the superior thyroid artery is external laryngeal nerve (branch of superior laryngeal nerve, vagus) which supplies cricothyroid muscle. 
All the muscles of larynx are supplied by recurrent laryngeal nerve, except the cricothyroid muscle.
Sensory supply to laryngeal mucosa above vocal cords is by internal laryngeal nerve and below the vocal cords by recurrent laryngeal nerve.