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 mean value of APDI in normal occlusion is: 
Select and explain. 
A. 78.4 ± 3.79, B. 81.4 ± 13.79, C. 89.3 ± 4.79, D. 91.2 ± 3.27
B: 81.4 ± 13.79
Answer: B: 81.4 ± 13.79 
Explanation: None