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: Unknown
[{'content': 'The hardest and most highly mineralized substance of tooth is called as \nSelect and explain. \nA. Dentine, B. Enamel, C. Cementum, D. Pulp', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]