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
Most common cause of hemobilia 
Select and explain. 
A. Trauma, B. Iatrogenic, C. Parasites, D. Tumors
B: Iatrogenic
Answer: B: Iatrogenic 
Explanation: Hemobilia Bleeding into the biliary tract from an abnormal aerial source to intrahepatic biliary tract fistula Poal venous bleeding into the biliary tree is rare, minor and selflimited Aerial hemobilia is the most common source Etiology Trauma : Iatrogenic (PTC) is the most common cause, blunt trauma is more common cause than penetrating trauma Gallstones Vascular pathology : Aneurysm, angiodysplasia, Parasitic infestation, liver abscess, cholangitis Ref: Sabiston 20th edition Pgno :1472-1474