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
If a histologic slide of the tooth and the content of its canal space could be obtained, the most likely finding in the region of radioluceny would be? 
Select and explain. 
A. Normal pulp, B. Clastic activity, C. Necrotic pulp, D. Marked decrease in cellularity
B: Clastic activity
Answer: B: Clastic activity 
Explanation: None