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: Microbiology
[{'content': 'The most common organism amongst the following that causes acute meningitis in an AIDS patient is - \nSelect and explain. \nA. Streptococcus pneumoniae, B. Streptococcus agalactiae, C. Cryptococcus neoformans, D. Listeria monocytogenes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cryptococcosis is the predominant cause of fatal fungal infection and causes acute... meningitis in patients with AIDS.\nIt may occur most common when CD4+ count falls below 200 cells/mm3.\nThe extra pulmonary cryptococcosis is one of the AIDS defining diseases.', 'role': 'assistant'}]