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
Urease negative is - 
Select and explain. 
A. E. coli, B. Proteus, C. Klebsiella, D. Staphylococci
A: E. coli
Answer: A: E. coli 
Explanation: None