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
Vitamin D deficiency 
Select and explain. 
A. Does not affect enamel, B. Does not affect dentin, C. Does not affect tooth development, D. All of the above.
B: Does not affect dentin
Answer: B: Does not affect dentin 
Explanation: None