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
After a class V amalgam restoration, patient experiences pain, which may be due to? 
Select and explain. 
A. Dentin (Hyper) sensitivity, B. Irreversible pulpal damage, C. Injury to adjacent gingiva, D. Any of the above
D: Any of the above
Answer: D: Any of the above 
Explanation: None