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
Percentage of SSI rate in patients with a clean contaminated wound? 
Select and explain. 
A. 1-2%, B. <10%, C. 10- 20 %, D. 20- 30 %
B: <10%
Answer: B: <10% 
Explanation: Answer- B. <10%Clean wound- 1- 2%Clean contaminated- 7- 10%Contaminated- 10- 20%Diy- >20%class I (clean):2%class II (clean contaminated):5-15%class III (contaminated):>15%class IV (diy):>30%