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
[{'content': "Which one of the following is a subcortical dementia? \nSelect and explain. \nA. Alzheimer's disease, B. Huntington's chorea, C. Normal pressure Hydrocephalus, D. Vit B12 deficiency", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]