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': 'The formation of which of the following does not represent normal physiological process of dentin formation: \nSelect and explain. \nA. Primary and secondary dentin, B. Secondary dentin and circumpulpal dentin, C. Tertiary dentin and sclerotic dentin, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]