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
Initial calcification of crown represents Which Nolla's stage: 
Select and explain. 
A. Stage 1, B. Stage 2, C. Stage 3, D. Stage 4
B: Stage 2
Answer: B: Stage 2 
Explanation: Stages
0 : Absence of crypt
1 : Presence of crypt
2 : Initial calcification of crown
3 : 1/3rd calcification of crown – completed
4 : 2/3rd of crown completed
5 : Crown almost completed
6 : Complete calcification of crown. Tooth shows eruptive movement
7 : 1/3rd of root completed
8 : 2/3rd of Root completed
9 : Root almost completed with open apex
10 : Apical end of Root completed