This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Which of the following causes the majority of UTIs in hospitalized patients? \nSelect and explain. \nA. Lack of fluid intake, B. Inadequate perineal care, C. Invasive procedures, D. Immunosuppression', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Invasive procedures such as catheterization can introduce bacteria into the urinary tract.\nA lack of fluid intake could cause the concentration of urine, but wouldn’t necessarily cause infection.', 'role': 'assistant'}]