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': 'Following are "essential diagnostic criteria" according to\ngraber except \nSelect and explain. \nA. Case history, B. Facial photographs, C. Periapical x-rays, D. Lateral cephalograms', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]