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: Surgery
[{'content': 'Infectionrate without antibiotic prophylaxis for clean contaminated surgery is \nSelect and explain. \nA. 1 - 2 %, B. 2 - 5 %, C. 6 - 9 %, D. 10 - 15 %', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Type of surgery\nInfection rate with prophylaxis\nInfection rate without prophyloxis\n\n\nClean surgery\n1 - 2 %\n1 - 2 %\n\n\nClean contaminated surgery\n3%\n6 - 9 %\n\n\nContaminated surgery\n6 %\n13 - 20%\n\n\nDirty surgery\n7%\n40%', 'role': 'assistant'}]