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
Preoperative medication of thyrotoxicosis are all except? 
Select and explain. 
A. PTU, B. Carbimazole, C. Propranolol, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Prevention of thyroid storm should be started add.