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: Surgery
Most common cause of hemobilia is 
Select and explain. 
A. Carcinoma, B. Iatrogenic trauma, C. Blunt trauma, D. Cirrhosis
B: Iatrogenic trauma
Answer: B: Iatrogenic trauma 
Explanation: Hemobilia is bleeding commonly from the liver or occasionally from the gallbladder into the biliary tract.Accidental trauma,iatrogenic trauma (50%) is the most common cause.In accidents,Hemobilia is more commonly caused by blunt trauma than penetrating one.Other causes include Vascular diseases of hepatic aery,malignant and benign liver diseases,poal hypeension,parasitic liver diseases,etc. Reference:SRB's manual of surgery,5th edition,page no:662