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
Bjork used the implants for predicting facial growth changes. This approach is called as: 
Select and explain. 
A. Longitudinal approach, B. Metric approach, C. Structural approach, D. Computerized predication
A: Longitudinal approach
Answer: A: Longitudinal approach 
Explanation: None