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': 'only epithelium in the body in which type4 collagen is absent in basal lamina: \nSelect and explain. \nA. Oral epithelium, B. Sulcular epithelium, C. Gingival epithelium, D. Junctional epithelium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]