This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary Tract Infections and Interstitial Cystitis, Subject name: Medicine
Urine of a UTI patient has a pH of more than 8, the probable organism is: 
Select and explain. 
A. Ecoli, B. Proteus, C. Klebsiella, D. Candida
B: Proteus
Answer: B: Proteus 
Explanation: Ans: B (Proteus) Ref: Harrison's 18th edn, pg 1245Explanation:Proteus UTICauses only 1% UTI in healthy womenCauses 5% of hospital acquired UTI15% of catheter associated UTIProduces urease, which hydrolyses urea- Ammonia- Alkaline urineAlkaline urine- precipitation of organic and inorganic compounds- Struvite and Carbonate-Apatite crystals, Staghorn calculi and forming Biofilm on catheter.