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
Internal resorption is due to_____________ 
Select and explain. 
A. Pulp necrosis, B. Acute inflammation of pulp, C. Chronic inflammation of pulp, D. None of the above
C: Chronic inflammation of pulp
Answer: C: Chronic inflammation of pulp 
Explanation: None