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
[{'content': 'Most common cause of vocal cord palsy is \nSelect and explain. \nA. Surgical, B. Inflammatory, C. Trauma, D. Malignancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Neuritis or surgical trauma (thyroidectomy) is the most impoant cause. Thyroid surgery is the most common cause when both recurrent and external laryngeal nerves of one side may be involved. Ref: PL Dhingra Textbook of Ear, Nose and Throat, Edition 6, page - 300', 'role': 'assistant'}]