This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Enterobacteriaceae are A/E - rpt \nSelect and explain. \nA. Pseudomonas, B. Klebsiella, C. V. Cholera, D. Proteus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: rpt question', 'role': 'assistant'}]