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
Which of the following is method of treating venous ulcer 
Select and explain. 
A. Hilton's method, B. Trivex method, C. Bisgaard method, D. Tessari method
C: Bisgaard method
Answer: C: Bisgaard method 
Explanation: Bisgaard method is method for treating venous ulcer.