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': "Most common cause dementia in adult- \nSelect and explain. \nA. Alzheimer's, B. Multiinfarct, C. Pick disease, D. Metabolic cause", 'role': 'user'}, {'content': "Answer: A \nExplanation: Alzheimer's disease is the most common cause of dementia overall as well as in older adults.\nVascular dementia is the second most common cause. Amongst vascular dementia, multi-infarct dementia is the most common cause.", 'role': 'assistant'}]