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
[{'content': 'Lamina densa contains: \nSelect and explain. \nA. Type 1 collagen., B. Type 2 collagen., C. Type 4 collagen., D. Type 6 collagen.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]