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
Infectionrate without antibiotic prophylaxis for clean contaminated surgery is 
Select and explain. 
A. 1 - 2 %, B. 2 - 5 %, C. 6 - 9 %, D. 10 - 15 %
C: 6 - 9 %
Answer: C: 6 - 9 % 
Explanation: Type of surgery
Infection rate with prophylaxis
Infection rate without prophyloxis


Clean surgery
1 - 2 %
1 - 2 %


Clean contaminated surgery
3%
6 - 9 %


Contaminated surgery
6 %
13 - 20%


Dirty surgery
7%
40%