This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parkinsonism and other movement disorders, Subject name: Medicine
[{'content': 'A 40-year-old man is brought to the doctor by his family for the rapid intellectual decline. Examination shows fast semi-purposive movements in hands. His father and grandfather had a similar illness. What is the diagnosis? \nSelect and explain. \nA. Pre-senile Dementia, B. Lewy body dementia, C. Coicobasilar degeneration, D. Huntington chorea', 'role': 'user'}, {'content': "Answer: D \nExplanation: The fast semi-purposive movements - Chorea. With advancing age chorea reduces and dystonia, rigidity, and myoclonus appear. Huntington's disease has an autosomal dominant pattern of inheritance . The intellectual decline is a common feature. Presenile dementia is seen in Down's syndrome Lewy body dementia presents with hallucinations, delusions, and dementia. Coicobasal degeneration/Alien hand syndrome-Asymmetric dystonia, apraxia (Loss of visuospatial skills), focal limb myoclonus", 'role': 'assistant'}]