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': 'Most common organism involved in urinary catheter induced urinary tract infection is - \nSelect and explain. \nA. E.coli, B. Pseudomonas, C. Staphylococcus epidermidis, D. Proteus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most commonly involved organism in causing urinary tract infection is E. Coli. Risk factors - More common in females Recent use of a diaphragm with spermicide, frequent sexual intercourse. Maternal history of diabetes ,UTI and incontinence . Obstruction in urine flow(calculi,malignancies) Incomplete voiding(residual urine) Foriegn body in urinary tract (catheter, calculi) Ref:Harrison 20 th edition pg no 969,970', 'role': 'assistant'}]