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
Calcification of permanent first molar usually 
begins in the: 
Select and explain. 
A. Third month of intrauterine life, B. In the sixth month of intrauterine life, C. At birth, D. In the third month of extra uterine life
C: At birth
Answer: C: At birth 
Explanation: None