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': 'In adult teeth, the type of dentin present underlying dentino-enamel junction is \nSelect and explain. \nA. Predentin, B. Mantle dentin, C. Interglobular dentin, D. Tertiary dentin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]