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
Proteus mirabilis is associated with which renal calculi? 
Select and explain. 
A. Uric acid, B. Struvite, C. Cysteine, D. Calcium Oxalate
B: Struvite
Answer: B: Struvite 
Explanation: Proteus mirabilis/Proteus vulgarisGram-negative rods, non-lactose fermenting* Highly motile; "swarming" motility on the surface of blood agar* Urease produced* Facultative anaerobe (Enterobacteriaceae), oxidase negativePathogenesis* Urease raises urine pH to cause kidney stones (staghorn renal calculi)Ref: Ananthanarayan; 7th edition; Page no: 283