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: Pathology
True about Malacetic teeth is/are: 
Select and explain. 
A. These are soft teeth., B. Softness is due to increase amount of interglobular dentin., C. This softness will leads to increase susceptibility to caries., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: None