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
Elastin fiber system present in the lamina propria consists all of these EXCEPT 
Select and explain. 
A. Oxytalan, B. Elastin, C. Elaunin, D. Collagen
D: Collagen
Answer: D: Collagen 
Explanation: None