This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycology, Subject name: Microbiology
[{'content': 'The most common organism amongst the following that causes acute meningitis in an AIDS patients is a- \nSelect and explain. \nA. Streptococcus pneumoniae, B. Streptococcus agalactiae, C. Cryptococcus neoformans, D. Listeria monocytogenes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C. neoformans infection - most common in patients with advanced HIV infection with CD4 T-cell counts < 200/ml Meningitis in Neonates or infants of 0-2 months: Escherichia coli > Group B streptococcus (S. agalactiae) > Listeria monocytogenes Overall Aseptic meningitis: Cryptococcus neoformans.. Capsular antigen detection from CSF or serum by latex agglutination test is a rapid and sensitive (95%).', 'role': 'assistant'}]