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 occlusal surface of an abutment tooth with acrylic\nveneering should be \nSelect and explain. \nA. In acrylic, B. In porcelain fused to metal, C. In metal 0.5 mm thick, D. In metal 0.25 mm thick', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]