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 indicated finish margin with porcelain fused to metal restoration is: \nSelect and explain. \nA. Shoulder, B. Shoulder with bevel, C. Heavy shoulder, D. Heavy chamfer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]