Final answer:
The correct tool for administering a contrast medium directly into the common bile duct during an intraoperative cholangiogram is a option a)T-tube.
Step-by-step explanation:
Intraoperative cholangiograms are procedures used to visualize the biliary tract during surgery, which can be performed through open or laparoscopic techniques. When contrast medium needs to be administered directly into the common bile duct to allow for X-ray visualization, one of the tools that can be used is a T-tube. Neither the Pigtail catheter, Foley catheter, nor Cholecystostomy tube is typically used for this purpose. Therefore, the correct answer to the question is: A. T-tube.