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': "Jackson's triad in orthodontic treatment includes \nSelect and explain. \nA. Structural balance, B. Esthetics harmony, C. Functional efficiency, D. All of the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]