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
In a perfect smile, the ratio of width to height of maxillary incisor is: 
Select and explain. 
A. 8:10, B. 6:08, C. 10:14, D. 20:25
A: 8:10
Answer: A: 8:10 
Explanation: None