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
The initial investigation of choice for a post cholecystectomy biliary stricture is 
Select and explain. 
A. Ultrasound guided aspiration, B. ERCP and stenting, C. Computed tomography, D. Magnetic resonance imaging
C: Computed tomography
Answer: C: Computed tomography 
Explanation: Computed Tomography CT is probably the best initial study, the results which help direct fuher investigations A good quality CT scan shows a dilated biliary tree and helps localise the level of ductal obstruction in patients with strictures CT identities fluid collections or ascites, which may suggest the possibility of vascular damage Other Radiological investigations in post cholecystectomy bile duct injury Duplex ultrasonography Percutaneous transhepatic cholangiography Magnetic resonance cholangiopancreatography. ERCP Isotopic scanning techniques Aretriography and delayed phase poography Ref: Blumga 5th edition Pgno :627