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
Preferred time forprophylacticantibiotic administration for surgery? 
Select and explain. 
A. 1 day befor surgery, B. I.M. 6 hrs before surgery, C. At the time of induction of anaesthesia, D. I.V. during surgery
C: At the time of induction of anaesthesia
Answer: C: At the time of induction of anaesthesia 
Explanation: Ans is C i.e. At the time of induction of anaesthesia "The appropriate antibiotic is chosen before surgery and administered before the skin incision is made."-Sabiston 18/e