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
1st evidence of calcification of Upper 1st molar is seen in 
Select and explain. 
A. at birth, B. 16 wk IU, C. 1 year after birth, D. 2 years after birth
A: at birth
Answer: A: at birth 
Explanation: None