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
[{'content': 'Organisms causing UTI are all except - \nSelect and explain. \nA. Proteus vulgaris, B. Citrobacter, C. Morganella, D. Hpv', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]