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 liver abscess is 
Select and explain. 
A. Proteus, B. E.coli, C. Klebsiella, D. Staphylococcus
B: E.coli
Answer: B: E.coli 
Explanation: E.coli most common in Western countries Klebsiella pneumonia most common in Asian countries Staphylococcus most common in children suffering from chronic granulomatous disease