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 is used in mixed dentition classification of malocclusion \nSelect and explain. \nA. Angles classification, B. Simon's orbital plane, C. Flush terminal plane, D. All of the above", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]