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 development of the first permanent molar is initiated at: 
Select and explain. 
A. Fourth month in utero., B. 14th month in utero., C. Second month in utero., D. First year after birth.
A: Fourth month in utero.
Answer: A: Fourth month in utero. 
Explanation: The development of the first permanent molar is initiated at the fourth month in utero.
The second molar is initiated at about the first year after birth, the third molar at the fourth or fifth years.