<prompt> Which one of the following is diagnosed by latex agglutination for antigen in CSF?CryptococcusAspergillosisCandidaHistoplasmosis  <response>: A Cryptococcus Approximately 90 of patients with cryptococcal meningoencephalitis, including all those with a positive CSF smear, have capsular antigen detectable in CSF or serum by latex agglutination. Certain important points about cryptococcus Cryptococcus is the only pathogenic yeast It is characterized by a prominent polysaccharide capsule, which stands out in Indian ink preparation Features which are seen in only in pathogenic cryptococci are Ability to grow at 37degC Ability to hydrolyse urea 