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
A 45 year old obese female from Mexico presents to her dermatologist. She noticed that her "hair is falling out." On questioning, she repos having followed a strict fat-free diet. Her alopecia is probably related to a deficiency of which of the following vitamins? 
Select and explain. 
A. Vitamin A, B. Vitamin C, C. Vitamin D, D. Vitamin E
A: Vitamin A
Answer: A: Vitamin A 
Explanation: Vitamin A