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
Development of supporting tissues of the tooth is initiated by 
Select and explain. 
A. Cells of dental follicle, B. Cells of odontogenic layer, C. Cementoblasts, D. Cells of the gingiva
A: Cells of dental follicle
Answer: A: Cells of dental follicle 
Explanation: None