This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Forensic Medicine
Estimation of age done after 25 years with changes in teeth is by 
Select and explain. 
A. Galton system, B. Bertillon system, C. Gustafsan's method, D. Pearson's formula
C: Gustafsan's method
Answer: C: Gustafsan's method 
Explanation: (C) Gustafsan's method > Gustafson's Method: The age estimation of adult over 25 years depends on the physiologic age changes in each of the dental tissue.