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 of thick cement liners : \nSelect and explain. \nA. 1-25 micron, B. 25-50 micron, C. 50-100 micron, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The thickness of thick cement liners ranges from 50 to 100 microns.', 'role': 'assistant'}]