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: Psychiatry
Reversible cause of dementia 
Select and explain. 
A. Hypothyroidism, B. Alzheimer's disease, C. None, D. Vitamin A deficieny
A: Hypothyroidism
Answer: A: Hypothyroidism 
Explanation: A i.e (Hypothyroidism)