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 minimally acceptable restoration for an endodontically treated maxillary first premolar is: \nSelect and explain. \nA. An onlay, B. An MOD amalgam, C. A full cast crown, D. An occlusal amalgam', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]