<prompt> Ampicillin prophylaxis is given in -Rectal surgerySplenectomyHead and neck surgeryBiliary surgery  <response>: 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. 