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
Bolton analysis is used to determine 
Select and explain. 
A. Arch length - tooth size discrepancy, B. Apical base Length to arch perimeter, C. Tooth size ratio in maxilla, D. Upper teeth to lower teeth size ratio
D: Upper teeth to lower teeth size ratio
Answer: D: Upper teeth to lower teeth size ratio 
Explanation: None