This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
The causative agent of Primary Amoebic Meningoencephalitis is: 
Select and explain. 
A. Endolimax nana, B. Dientamoeba fragilis, C. Naegleria fowleri, D. Entamoeba histolytica
C: Naegleria fowleri
Answer: C: Naegleria fowleri 
Explanation: (C) Naegleria fowleri # Human infection of naegleria comes from water containing the amoebae and usually follows swimming or diving in ponds.> Patients are mostly previously healthy young adults and children.> The amoebae invade the nasal mucosa, pass through the olfactory nerve and initiate an acute meningitis and encephalitis (primary amoebic meningoencephalitis).