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: Unknown
Most common nerve injured by ligation of sup thyroid artery - 
Select and explain. 
A. RLN, B. Facial N., C. Mandibular M., D. Auditory N.
A: RLN
Answer: A: RLN 
Explanation: Ans. is 'a' i.e., RLN o Recurrent laryngeal nerve (RLN) may be damaged during superior thyroid artery- ligation. Most common nerve injured by ligation of 1. Sup thyroid artery- Recurrent laryngeal nerve and 2. Inferior thyroid artery- Superior laryngeal nerve