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: Pharmacology
Prophylactic antibiotics to prevent surgical site infection are best administered : 
Select and explain. 
A. After commencement of surgery, B. 30 minutes before incision, C. At the end of surgery, D. With pre medication
B: 30 minutes before incision
Answer: B: 30 minutes before incision 
Explanation: None