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
Which of the following tooth structure during formation
is most effected due to Vit -A deficiency 
Select and explain. 
A. Enamel, B. Dentin, C. Cementom, D. Periodontal Ligament
A: Enamel
Answer: A: Enamel 
Explanation: None