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
Tooth discoloration is due to: 
Select and explain. 
A. Acute pulpal abscess, B. Pulpal hyperemia, C. Pulpal death, D. None of the above
C: Pulpal death
Answer: C: Pulpal death 
Explanation: None