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': 'Which of the following dentinal layers is more mineralized \nSelect and explain. \nA. Peritubular dentin, B. Inter tubular dentin, C. Dentinal tubules, D. Circum pulpal dentin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]