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 contains: 
Select and explain. 
A. Type 1 collagen., B. Type 2 collagen., C. Type 4 collagen., D. Type 6 collagen.
C: Type 4 collagen.
Answer: C: Type 4 collagen. 
Explanation: None