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: Unknown
Preferred time for prophylactic antibiotic administration for surgery: 
Select and explain. 
A. 1 day before surgery, B. At the time of induction of an anesthesia, C. I.V during surgery, D. Through I.M route before 6 hr of surgery
B: At the time of induction of an anesthesia
Answer: B: At the time of induction of an anesthesia 
Explanation: Ans- B