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
Epithelial attachment is derived from 
Select and explain. 
A. Reduced enamel epithelium, B. Dental papilla, C. Inner enamel epithelium, D. Dental sac
A: Reduced enamel epithelium
Answer: A: Reduced enamel epithelium 
Explanation: None