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: Surgery
[{'content': 'Vocal cord palsy in thyroid surgery is due to injury to- \nSelect and explain. \nA. Superficial laryngeal nerve, B. Recurrent laryngeal nerve, C. Ansa cervicalis, D. Vagus nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]