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': 'Most dangerous complication in a pt. who had undergone thyroid surgery and develop hematoma at the operative site - \nSelect and explain. \nA. Respiratory obstruction, B. Recurrent laryngeal nerve palsy, C. Dysphagia, D. Shock', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]