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
Antibiotics should be given when with surgery for prophylaxis - 
Select and explain. 
A. 1 hour before, B. 1 hour after, C. 2 hours before, D. 2 hours after
A: 1 hour before
Answer: A: 1 hour before 
Explanation: Ans. is 'a' i.e., 1 hour before Intravenous administration at Induction of Anesthesia is optimal