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 does not require radiograph: \nSelect and explain. \nA. Tanaka and Johnson, B. Hixon - old father., C. Stanley and Kerber, D. Nance model analysis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]