This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Most fatal amoebic encephalitis is caused by ? 
Select and explain. 
A. E.histolytica, B. Naeglaria, C. E. dispar, D. Acanthamoeba
B: Naeglaria
Answer: B: Naeglaria 
Explanation: Ans. is 'b' i.e., Naeglaria . Amongst the given options Naeglaria and Acanthamoeba cause amoebic encephalitis. " The prognosis of Naeglaria encephalitis is uniformaly poor, most patients die within a week."---Harrison "Acanthamoeba encephalitis follows a more indolent course."----- Harrison . So, amongst the given options Naeglaria causes most fatal amoebic encephalitis .