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
The ratio of upper anterior facial height and lower anterior facial height in normal occlusion cases is 
Select and explain. 
A. 60 :	40, B. 45 :	55, C. 55 :	45, D. 40 :	60
B: 45 :	55
Answer: B: 45 :	55 
Explanation: None