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
Meningoencephalitis caused by which amoeba: 
Select and explain. 
A. E. histolytica, B. Nageleria, C. Giardia, D. E.coli
B: Nageleria
Answer: B: Nageleria 
Explanation: Nageleria