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 among 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 occurs worldwide since the fungus is soil saprophyte and is the commonest systemic mycosis in India. Cryptococcal meningitis is the most serious type of cryptococcal infection seen in AIDS patients compared to others. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition', 'role': 'assistant'}]