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
[{'content': 'Bjork used the implants for predicting facial growth changes. This approach is called as: \nSelect and explain. \nA. Longitudinal approach, B. Metric approach, C. Structural approach, D. Computerized predication', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]