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': 'Epithelium of the inner surface of the gingival sulcus: \nSelect and explain. \nA. Has no rete pegs, B. Has prominent rete pegs, C. Is keratinized, D. Is para-keratinized', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]