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: Pathology
Radiation caries is an example of: 
Select and explain. 
A. Early childhood caries., B. Rampant caries, C. Exposure caries., D. None of the above.
B: Rampant caries
Answer: B: Rampant caries 
Explanation: None