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': 'A highly polished surface on a metallic dental restoration aids considerably in the prevention of the: \nSelect and explain. \nA. Dimensional change, B. Thermal conductivity, C. Warpage, D. Tarnish and corrosion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]