The substance used in OCG is: (A) Iopanoic acid, (B) Sodium diatrozite, (C) Meglumine iodothalamate, (D) Biligraffin
Answer is A. Iopanoic acid is used in oral cholecystography Biligraffin is used in IV cholangiography Ref: Sabiston 20th edition Pgno :1487