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': 'Reversible cause of dementia -a) Post encephalitisb) Multi infarctc) Hydrocephalusd) Senile dementia \nSelect and explain. \nA. a, B. bc, C. ad, D. ac', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Chronic meningoencephalitis and hydrocephalus are reversible causes of dementia.', 'role': 'assistant'}]