This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dementia, Subject name: Medicine
[{'content': 'The most common late CNS complication of HIV is: \nSelect and explain. \nA. Dementia, B. Ataxia, C. Seizures, D. Delirium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Dementia", 'role': 'assistant'}]