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
All are common causes of a pyogenic liver abscess Except 
Select and explain. 
A. E. coli, B. Proteus, C. Klebsiella, D. Staphylococcus
B: Proteus
Answer: B: Proteus 
Explanation: E. coli- MC in western countriesKlebsiella pneumonia- MC in Asian countriesStaphylococcus- MC in children, suffering from a chronic granulomatous disease