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 is not an appropriate material for composite hand instruments: \nSelect and explain. \nA. Teflon, B. Teflon coated material., C. Stainless steel., D. Non metallic.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stainless steel instruments should not be used because the composite will stick to the instrument.', 'role': 'assistant'}]