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 in enamel starts at : 
Select and explain. 
A. Enamel matrix, B. Root, C. CEJ, D. DEJ
D: DEJ
Answer: D: DEJ 
Explanation: Calcification of enamel proceeds from cusps or incisal edges towards cervical line and from DEJ it proceeds towards surface.