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': 'Which of the following bur is used in the preparation of cavity restored with porcelain fused to metal? \nSelect and explain. \nA. Carbide bur, B. Diamond bur, C. Stainless steel bur, D. Diamond bur for porcelain and carbide bur for metal', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]