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
A drug used for Buerger's disease? 
Select and explain. 
A. Propranolol, B. Xanthinol nicotinate, C. GTN, D. All the above
B: Xanthinol nicotinate
Answer: B: Xanthinol nicotinate 
Explanation: A drug used in Buerger's disease is Xanthinol nicotinate. Complamina retard (xanthine nicotinate) tablet was used daily once earlier. Now, graded injection of xanthine nicotinate 3000 mg from day 1 to 9000 mg on day 5 is used to promote ulcer healing.
It also helps to increase claudication distance as a temporary basis. Beta blockers such as propranolol & GTN have no ulcer healing property in case of Thromboangitis obliterans (Buerger's disease).