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
Most common cause of pyogenic liver abscess - 
Select and explain. 
A. Diverticulitis, B. Stricture of CBD, C. Subdiaphragmatic abscess, D. Empyema in chest
B: Stricture of CBD
Answer: B: Stricture of CBD 
Explanation: 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 ".