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': 'Urease test is positive for: March 2013 \nSelect and explain. \nA. E. coli, B. Klebsiella, C. V. cholerae, D. Filaria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Klebsiella Urease It catalyzes the hydrolysis of urea to produce ammonia and carbamate, the carbamate produced is subsequently degraded by spontaneous hydrolysis to produce another ammonia and carbonic acid. Urease activity tends to increase the pH of the environment in which it is as it produces ammonia, as it is a basic molecule. Ureases are found in numerous bacteria, fungi, algae, plants and some inveebrates, as well as in soils, as a soil enzyme. They are nickel-containing metalloenzymes of high molecular weight. Mnemonic (PUNCH-K): P-Proteus; U-Ureaplasma; N-Nocardia; C-Cryptococcus; H-Helicobacter; K: Klebsiella', 'role': 'assistant'}]