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': '18/8 stainless steel \nSelect and explain. \nA. 18% Nickel 8% Chromium, B. 18% Chromium 8% Copper, C. 18% Chromium 8% Nickel, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]