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
Enterobacteriaceae is classified based on: 
Select and explain. 
A. Mannitol fermentation, B. Catalase and oxidase reaction, C. Oxygen requirement, D. Lactose fermentation
D: Lactose fermentation
Answer: D: Lactose fermentation 
Explanation: Ans. is. 'd' i. e., Lactose fermentation