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
[{'content': "Which of the following is method of treating venous ulcer \nSelect and explain. \nA. Hilton's method, B. Trivex method, C. Bisgaard method, D. Tessari method", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bisgaard method is method for treating venous ulcer.', 'role': 'assistant'}]