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': 'The pin diameter of Minim (inch/mm) is: \nSelect and explain. \nA. 0.019/0.48, B. 0.024/0.61, C. 0.015/0.38, D. 0.027/0.78', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]