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
Lamina densa of the gingival basement membrane is rich in 
Select and explain. 
A. Type I and III collagen, B. Type III collagen, C. Type IV collagen, D. Type I collagen
C: Type IV collagen
Answer: C: Type IV collagen 
Explanation: None