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
Ampicillin prophylaxis is given in - 
Select and explain. 
A. Rectal surgery, B. Splenectomy, C. Head and neck surgery, D. Biliary surgery
A: Rectal surgery
Answer: A: Rectal surgery 
Explanation: • Prophylactic antibiotics in biliary surgery are designed to reduce the incidence of postoperative wound infections.
• The efficacy of antibiotics in the prevention of wound infections has been demonstrated with first, second and third generation cephalosporins, ampicillin associated with clavulanate, ureido-penicillins, aminoglycosides, sulfonamides and quinolones.