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
Radiographs are useful in evaluating success and failure at recalls because they do which of the following? 
Select and explain. 
A. Record subjective symptoms, B. Show pulp vitality, C. May show failures that often occur without adverse signs or symptoms, D. Accurately diagnose apical pathosis
C: May show failures that often occur without adverse signs or symptoms
Answer: C: May show failures that often occur without adverse signs or symptoms 
Explanation: None