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
Dentinal tubules are calcified in 
Select and explain. 
A. Sclerotic dentin, B. Primary dentin, C. Secondary dentin, D. Interglobular dentin
A: Sclerotic dentin
Answer: A: Sclerotic dentin 
Explanation: None