<prompt> Best way to confirm that no stones are left back in the CBD?CholedochoscopePalpationCholangiogramERCP  <response>: Ans. is c i.e., Cholangiogram o An operative cholangiogram at time of cholecystectomy will also demonstrate presence or absance of bile duct stones.o If a CBD exploration was performed and a T-tube left in place, a T-tube cholangiogram is done before its removal. 