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
Estimate the dental age from the radiograph: 
Select and explain. 
A. 5 years, B. 10 years, C. 15 years, D. 25 years
C: 15 years
Answer: C: 15 years 
Explanation: None