Cerebral amoebiasis is not caused by: (A) Naegleria, (B) Acanthamoeba, (C) Dientamoeba, (D) Balamuthia
Answer is C. Three free living amoebae are neuropathogenic (encephalitis)

Naegleria fowleri causes primary amoebic meningoencephalitis.  
Acanthamoeba causes granulomatous amoebic encephalitis.
Balamuthia mandrillaris causes amoebic meningoencephalitis.