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': 'In a perfect smile, the ratio of width to height of maxillary incisor is: \nSelect and explain. \nA. 8:10, B. 6:08, C. 10:14, D. 20:25', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]