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: Pathology
Amino acid that is high in root dentin used for age estimation is 
Select and explain. 
A. Tyrosine, B. Serine, C. Aspartic acid, D. Glycine
C: Aspartic acid
Answer: C: Aspartic acid 
Explanation: None