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': 'Medium thickness rubber dam is: \nSelect and explain. \nA. 0.006 inch, B. 0.008 inch, C. 0.010 inch, D. 0.014 inch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]