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': 'Which of the following are goals of orthognathic surgery? \nSelect and explain. \nA. To improve facial esthetics, B. To shorten orthodontic treatment time, C. To improve orthodontic treatment results, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The goals of ortho\xa0esthetics are:\n\nTo improve facial esthetic and self-image of patient.\nTo shorten orthodontic treatment time and improve orthodontic treatment results.\nTo improve PDL stability and prognosis.\nTo correct jaw relationships prior to major restorative procedure.', 'role': 'assistant'}]