<prompt> The most common organism amongst the following that causes acute meningitis in an AIDS patient is -Streptococcus pneumoniaeStreptococcus agalactiaeCryptococcus neoformansListeria monocytogenes  <response>: Cryptococcosis is the predominant cause of fatal fungal infection and causes acute... meningitis in patients with AIDS.It may occur most common when CD4 count falls below 200 cellsmm3.The extra pulmonary cryptococcosis is one of the AIDS defining diseases. 