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 finish lines is indicated for facial surfaces of metal ceramic restorations \nSelect and explain. \nA. Shoulder, B. Chamfer, C. Chisel edge, D. Feather edge', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]