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
[{'content': 'The tooth bud for the third molar is initiated at about the age of: \nSelect and explain. \nA. 6th month I.U, B. 1st year of life, C. 2nd year of life, D. 8th year of life', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]