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: Microbiology
[{'content': 'Enterobacteriaceae is classified based on: \nSelect and explain. \nA. Mannitol fermentation, B. Catalase and oxidase reaction, C. Oxygen requirement, D. Lactose fermentation', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is. 'd' i. e., Lactose fermentation", 'role': 'assistant'}]