This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'In a patient of the 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 peritonitis means peritonitis without any apparent source of contamination.Enteric gram-negative organism E. coli most commonly encountered but sometime gram-positive organisms such as streptococci and enterococci also responsible.', 'role': 'assistant'}]