This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'All are true about primary bacterial peritonitis, EXCEPT: \nSelect and explain. \nA. Ascitic fluid PMN count > 250 is diagnostic, B. Microbiology of PBP is distinctive, C. Some patients may be totally asymptomatic, D. Usually does not respond to routine antimicrobial therapy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PBP is commonly present with fever, but it can present without any symptoms too. Ascitic fluid analysis should be performed in all suspected cases and PMN > 250/l is diagnostic of PBP. Escherichia coli are most commonly encountered as the cause of PBP. In PBP, a single organism is typically isolated. PBP is usually treated with cefotaxime and it responds very well to it. Ref: Harrison, E-18, P-1081.', 'role': 'assistant'}]