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
All are causes of subcortical dementia except - 
Select and explain. 
A. Alzheimer's disease, B. Parkinson's disease, C. Supranuclear palsy, D. HIV associated dementia
A: Alzheimer's disease
Answer: A: Alzheimer's disease 
Explanation: Alzheimer’s disease is a cortical dementia.