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 cannot be assessed with cephalometric radiograph? \nSelect and explain. \nA. Mandibular retrusion, B. Vertical facial disproportion, C. Incisor position & anguLation, D. Adequacy of dental arch perimeter', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]