This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatic Tumors, Cysts, and Abscesses, Subject name: Surgery
[{'content': 'Most common cause of pyogenic liver abscess - \nSelect and explain. \nA. Diverticulitis, B. Stricture of CBD, C. Subdiaphragmatic abscess, D. Empyema in chest', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Stricture of CBD Routes of infection to liverAlong the bile ducts (MC)Stone impacted in CBDStricture of CBD - benign, malignantCryptogenicVia the portal veinVia the hepatic arteryBy direct extensionFrom a subdiaphragmatic abscessFrom an empyema in chestFrom suppuratative cholecystitisFrom perinephric abscessPenetrating or blunt traumaAlso knowo MC organisms (Ref. Sabiston, Schwartz)Escherichia coliKlebsiella pneumoniaAlso noteo Sabiston 18th ed. writes that now there are 2 most common cause of liver abscess i.e. Cryptogenic and infections from the biliary tree. It writes- "Along with cryptogenic infections, infections from the biliary\' tree are presently the most common identifiable cause of hepatic abscess ".', 'role': 'assistant'}]