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
Junctional epithelium 
Select and explain. 
A. Lines the gingival sulcus, B. Is permeable, C. Is derived initially from the outer enamel epithelium, D. Is attached to enamel by desmosomes
B: Is permeable
Answer: B: Is permeable 
Explanation: None