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': 'Best suited preformed pontic for maxillary anterior is: \nSelect and explain. \nA. Flatback pontic with porcelain facing., B. Pontip., C. Trupontics., D. Pin facing.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]