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': "Model analysis indicated for 2 quadrants: \nSelect and explain. \nA. Hixon-old father, B. Peck and peck index, C. Pont's index, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: Key Concept:\nThe question wants to ask about the analysis that can be performed in 2 quadrants i.e. in single arch either maxilla or mandible.\xa0\xa0\nExamples:\xa0\n\nHixon - old father (mandibular arch)\nPeck and peck index (mandibular arch)\nPont's index (maxillary arch)", 'role': 'assistant'}]