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
Ugly duckling stage coincides with transitional phase 
Select and explain. 
A. 1st transitional phase, B. Inter transitional, C. 2nd transitional, D. All of the above
C: 2nd transitional
Answer: C: 2nd transitional 
Explanation: None