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
The relationship between the pulpal and periodontal tissue complex begins during dental development at 
Select and explain. 
A. Adolescent stage, B. 5-10 years, C. Embryonic stage, D. None of the above
C: Embryonic stage
Answer: C: Embryonic stage 
Explanation: None