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
Which of the following is true about calcification of teeth? 
Select and explain. 
A. Calcification of primary teeth is almost complete at time of birth, B. Calcification of all primary teeth and few permanent teeth complete at birth, C. Calcification of all permanent teeth complete at birt, D. Calcification of primary teeth starts around birth
A: Calcification of primary teeth is almost complete at time of birth
Answer: A: Calcification of primary teeth is almost complete at time of birth 
Explanation: None