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
Which of the following will not lead to respiratory distress after Thyroid Surgery - 
Select and explain. 
A. Laryngomalacia, B. Bilateral recurrent laryngeal nerve injury, C. Hypocalcemia, D. None
D: None
Answer: D: None 
Explanation: Ans is None All the given conditions are able to cause resp. distress. Endocrine surgery of Head & Neck writes "The reason for airway compromise include : bilateral recurrent laryngeal nerve injury tracheal malacia from longstanding tracheal compression caused by a large thyroid mass subglottic edema from laryngeal involvement with tumor, tracheal invasion by tumor post-op hemorrhage or hematoma." Hypocalcemia can also cause stridor by causing laryngeal spasm