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': 'After thyroidectomy, pt. developed stridor within 2 hrs. All are likely cause of stridor except : \nSelect and explain. \nA. Hypocalcemia, B. Recurrent laryngeal nerve palsy, C. Laryngomalacia, D. Wound hematoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]