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': 'Radiographs are useful in evaluating success and failure at recalls because they do which of the following? \nSelect and explain. \nA. Record subjective symptoms, B. Show pulp vitality, C. May show failures that often occur without adverse signs or symptoms, D. Accurately diagnose apical pathosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]