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': 'Localized formation of dentin on the pulp-dentin border formed in reaction to caries or restorative procedures is known as \nSelect and explain. \nA. Tertiary dentin, B. Secondary dentin, C. Primary dentin, D. Interglobular dentin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]