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': 'Choice of restoration in endodontically treated anterior\nteeth \nSelect and explain. \nA. Metal ceramic crown, B. All ceramic crown, C. Acrylic crown, D. All metal crown', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]