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: Dental
[{'content': 'Functions of the irrigating solution are all, except: \nSelect and explain. \nA. Lubrication, B. Debridement, C. Antimicrobial, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It should:\n\nHave broadspectrum antimicrobial properties.\nAid in the debridement of the canal system.\nHave the ability to dissolve necrotic tissue or debris.\nHave low toxicity level.\nBe a good lubricant.\nHave low surface tension so that it can easily flow into\xa0inaccessible areas.\nBe able to effectively sterilize the root canal (or at least disinfect them).\nBe able to prevent formation of smear layer during instrumentation or dissolve the latter once, it is formed.\nInactivate endotoxin.', 'role': 'assistant'}]