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': 'Finish line prepared in full veneer crown is \nSelect and explain. \nA. Buccal shoulder & lingually chamfer, B. Lingually shoulder & buccally chamfer, C. All shoulder, D. All chamfer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]