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
The tooth bud for the third molar is initiated at about the age of: 
Select and explain. 
A. 6th month I.U, B. 1st year of life, C. 2nd year of life, D. 8th year of life
D: 8th year of life
Answer: D: 8th year of life 
Explanation: None