This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
After exploration of common bile duct, the T-tube is removed on which of the following days 
Select and explain. 
A. 3rd postoperative day, B. 4th postoperative day, C. 12th postoperative day, D. 6th postoperative day
C: 12th postoperative day
Answer: C: 12th postoperative day 
Explanation: Cholecystectomy with choledochotomy and CBD exploration T-tube is left in place for cholangiography and removal of any retained stone T-tube cholangiogram is done on 7th - 10th day Post-operatively Remove T-tube if cholangiogram is normal If residual stone is discovered on the postoperative cholangiogram, T-tube should be left in place for 4-6 weeks for the tract to mature The stones are removed percutaneously through the matured tract by Burhenne's technique Ref: Sabiston 20th edition Pgno : 1511