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': 'Which of the following items in the dental operatory cannot be classified as a semi-critical item: \nSelect and explain. \nA. Suction tip, B. Handpiece, C. Endodontic file, D. Water syringe tip', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Critical/Non Critical instrument:\nCritical: Contact/penetrate/cut tissues e.g. endodontic file, scalpel\nSemi Critical: Which touch mucosa BUT donot cut/penetrate tissue e.g. air/water syringe tip, suction tip, handpiece\nNon-Critical: Surface disinfection is adequate e.g. X-ray stand, light source', 'role': 'assistant'}]