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
Periodontal ligament has predominantly: 
Select and explain. 
A. Type II collagen fibres, B. Oxytalan fibres, C. Elastic fibres, D. Type I collagen fibres
D: Type I collagen fibres
Answer: D: Type I collagen fibres 
Explanation: None