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': 'To avoid pulpal irritation below a resistant metallic restoration, the minimum dentin thickness which should remain is: \nSelect and explain. \nA. 0.5mm, B. 1.5mm, C. 1.0mm, D. 2.0mm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]