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
Which is true about Enterobacteriaceae 
Select and explain. 
A. All are oxidase negative, B. Nitrate reduction negative, C. Glucose not fermented by all, D. Motility by polar flagellum
A: All are oxidase negative
Answer: A: All are oxidase negative 
Explanation: They are motile by peritrichous flagella, ferments glucose producing acid, reduces nitrates to nitrites, but forms catalase, not oxidase. They are non-sporing, non-acid, Gram-negative bacilli that are found in the gut of man and animals. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 279