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
All of the following bacteria test "Urease positive" except: 
Select and explain. 
A. E. coli, B. Proteus, C. Klebsella, D. Staphylococcus
A: E. coli
Answer: A: E. coli 
Explanation: Ans. (a) E. colt See below Urease test is positive in urease producing bacteria which includes: Proteus ii. S. aureus Morganella iv. Klebsiella v. Yersinia vi. Cryptococcus vii. Diptheroids viii. Mycobacterium except MAC ix. H. Pylori Mnemonic: PSM KY CD Meri Hai