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: Medicine
[{'content': 'All of the following are features if CD4 count drop below 50cells/ mmcubic, except \nSelect and explain. \nA. HIV associated dementia., B. CMV retinitis., C. Disseminated mycobacterium avium intracellulare., D. None.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]