This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
Organisms causing UTI are all except - 
Select and explain. 
A. Proteus vulgaris, B. Citrobacter, C. Morganella, D. Hpv
A: Proteus vulgaris
Answer: A: Proteus vulgaris 
Explanation: Etiology of Uncomplicated UTI- E. Coli accounts for 75-90% of isolates. Staphylococcus saprophytics Klbsiella Proteus Enterococcus Citrobacter species Complicated UTI- E. Coli remains the predominant orgamism but other aerobic gram negative rods,such as pseudomonas aeruginosa, klebsiella,citrobacter,actinobacter ,morganella species , Gram positive bacteria(enterococci and staphylococcus aureus) and yeasts are also impoant pathogens in complicated UTI. Ref:Harrison 20 th edition pg no 969