<prompt> The most common cause of seizures in a patient of AIDS isToxoplasmosisCryptococcal meningitisProgressive multifocal leucoencephalopathyCNS lymphoma  <response>: Ans. is a i.e., Toxoplasmosis Neurological manifestations of H.I.V. AIDS dementia complex HIV encephalopathy is a result of direct effects of HIV on CNS not an oppounistic disease. It is subcoical dementia. Most common cause of seizures -- Toxoplasma Most common cause of meningitis -- Cryptococcus M.C. cause of focal neurological deficit -- Toxoplasma Toxoplasmosis is the most common CNS infection in AIDS. CNS lymphoma and prograssive multifocal leukoencephalopathy may occur. 