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
Drug used for Burger's disease- 
Select and explain. 
A. Xanthinol micotinate, B. Propranolol, C. GTN, D. All the above
A: Xanthinol micotinate
Answer: A: Xanthinol micotinate 
Explanation: None