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': 'Excess deposition of calcium in the dentinal tubules is referred to as \nSelect and explain. \nA. Sclerotic dentin, B. Mantle dentin, C. Interglobular dentin, D. Intertubular dentin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]