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': 'For gold inlays gingival margin finish line should be \nSelect and explain. \nA. Shoulder preparation, B. Chamfer preparation, C. Bevel, D. Knife edge', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]