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': 'Die spacers are applied in several coats within…………………of the preparation line \nSelect and explain. \nA. 0.3 mm, B. 0.5 mm, C. 1.5 mm, D. 1.0 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]