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
Most dangerous complication in a pt. who had undergone thyroid surgery and develop hematoma at the operative site - 
Select and explain. 
A. Respiratory obstruction, B. Recurrent laryngeal nerve palsy, C. Dysphagia, D. Shock
A: Respiratory obstruction
Answer: A: Respiratory obstruction 
Explanation: None