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
Prevention of surgical wound infection done by 
Select and explain. 
A. Pre-op shaving, B. Monofilament sutures, C. Pre-op antibiotic therapy, D. Wound apposition
C: Pre-op antibiotic therapy
Answer: C: Pre-op antibiotic therapy 
Explanation: Giving antibiotics prior to surgery (prophylactic antibiotics) one hour before surgery has been identified as an intervention for prevention of surgical site infections.
Shaving is now avoided and clipping of hair is preferred.
Preop bath, Blood glucose control, and maintaining normothermia (esp in colorectal surgery) are other useful measures.