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
[{'content': 'Most common nerve injured by ligation of sup thyroid artery - \nSelect and explain. \nA. RLN, B. Facial N., C. Mandibular M., D. Auditory N.', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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", 'role': 'assistant'}]