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': 'Hapsburg jaw refers to: \nSelect and explain. \nA. Class 3 malocclusion, B. Class 2 malocclusion, C. Posterior cross bite., D. Anterior cross bite', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]