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: Microbiology
[{'content': 'Cause of clostridium difficile associated diarrhea - \nSelect and explain. \nA. Trauma, B. Dairy products, C. Fried rice, D. Antibiotic use', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Prolonged broad spectrum antibiotic therapy is the most important risk factor for Clostridium difficile associated\xa0diarrhea\nRef: Apurba Sastry’s Essentials of Medical Microbiology 1/e p265, Ananthanarayan 9/e p265', 'role': 'assistant'}]