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: Biochemistry
Keratosis is a feature of deficiency of 
Select and explain. 
A. Vit A, B. Vit C, C. Vit D, D. Folic acid
A: Vit A
Answer: A: Vit A 
Explanation: None