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
Pink tooth of Mummery 
Select and explain. 
A. Internal Resorption, B. External Resorbtion, C. Chronic Pulpitis, D. Acute pulpitis
A: Internal Resorption
Answer: A: Internal Resorption 
Explanation: None