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: Unknown
[{'content': 'In a patient of nephritic syndrome with spontaneous bacterial peritonitis, which one of the following micro-organisms is most commonly involved? \nSelect and explain. \nA. Proteus, B. Escherichia, C. Pneumococcus, D. Staphylococcus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Spontaneous bacterial peritonitismeans peritonitis without any apparent source of contamination.\nEnteric gram-negative organismE. coli most commonly encountered but sometime gram-positive organism such as streptococci and enterococci also responsible.', 'role': 'assistant'}]