This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
[{'content': "Drug used for Buerger's disease ? \nSelect and explain. \nA. Xanthinol nicotinate, B. Propranolol, C. GTN, D. All the above", 'role': 'user'}, {'content': "Answer: A \nExplanation: . 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 propey in case of Thromboangitis obliterans (Buerger's disease). Ref :- SRB manual of Surgery 4th edition , Pg 184", 'role': 'assistant'}]