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': 'Thickness for bases applied in a cavity: \nSelect and explain. \nA. 0.1-0.5 mm, B. 0.5-0.75 mm, C. 0.75-1 mm, D. 0.25-0.5 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]