This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Medicine
Investigation of choice in Hemobilia? 
Select and explain. 
A. ERCP, B. Angiography, C. Upper GI endoscopy, D. Barium study
B: Angiography
Answer: B: Angiography 
Explanation: * Hemobilia is suspected if Upper GI endoscopy shows presence of blood in duodenum but confirmation of diagnosis is done only after angiography. * Celiac axis angiography should always be accompanied with superior mesenteric aeriography because anomalous/accessory right hepatic aery may originate from the SMA.