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 gingiva is attached to the tooth by: 
Select and explain. 
A. Lamina propria, B. Periosteum, C. Epithelial attachment, D. Gingival fibers
D: Gingival fibers
Answer: D: Gingival fibers 
Explanation: None