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': 'Hardness of fully mineralized cementum is \nSelect and explain. \nA. Less than dentin, B. More than dentin, C. Equal dentin, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]