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
[{'content': 'Most common cause of liver abscess is \nSelect and explain. \nA. Proteus, B. E.coli, C. Klebsiella, D. Staphylococcus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: E.coli most common in Western countries Klebsiella pneumonia most common in Asian countries Staphylococcus most common in children suffering from chronic granulomatous disease', 'role': 'assistant'}]