This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic mental disorders, Subject name: Psychiatry
Subcoical dementia is seen in all except 
Select and explain. 
A. Parkinsonism, B. Alzheimer's disease, C. Wilson's disease, D. Huntingtons chorea
B: Alzheimer's disease
Answer: B: Alzheimer's disease 
Explanation: Coical dementia, ex: Alzheimer's disease, Pick's disease. Site of lesion is Coex(frontal & temporoparieto-occipital association areas, & hippocampus). Subcoical dementia, ex: Huntington's chorea, Parkinson's disease, progressive supranuclear palsy, Wilson's disease. Site of lesion is subcoical grey matter(thalamus, basal ganglia, & rostral brain stem). Reference: A sho textbook of Psychiatry by Niraj Ahuja, 7th edition, page 24.