A 30yrs old patient treated with features of acute meningoencephalitis in casualty . His CSF on wet mount microscopy revealed motile unicellular microorganisms.The most likely organism is:
a.Naegleria fowleri
b.Acanthamoeba castellani
c.Entamoeba histolytica
d.Trypanosoma cruzi
ans:a.Naegleria fowleri