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': 'Most often used thickness of the matrix band is \nSelect and explain. \nA. 0.0015 cm, B. 0.0015 inch, C. 0.015 inch, D. 0.0028 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]