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 common cause of respiratory disease after thyroidectomy is? 
Select and explain. 
A. B/L Recurrent laryngeal nerve palsy, B. Tension hemotoma, C. Laryngeal edema, D. Hyperparathyroidism
C: Laryngeal edema
Answer: C: Laryngeal edema 
Explanation: Laryngeal edema is the most common cause of post - operative respiratary distress after thyroidectomy.