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
Which of the following is not responsible for endogenous staining of teeth during development? 
Select and explain. 
A. Tetracycline, B. Rh incompatibility, C. Neonatal liver disease, D. Vitamin-C deficiency
D: Vitamin-C deficiency
Answer: D: Vitamin-C deficiency 
Explanation: None