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
Which one of the following is a subcortical dementia? 
Select and explain. 
A. Alzheimer's disease, B. Huntington's chorea, C. Normal pressure Hydrocephalus, D. Vit B12 deficiency
B: Huntington's chorea
Answer: B: Huntington's chorea 
Explanation: None