This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Microbiology
Which of the following is true regarding Naegleria fowleri is commonly acquired by? 
Select and explain. 
A. Salt water living, B. Fresh water living, C. Sulfur springs, D. Swimming pool
B: Fresh water living
Answer: B: Fresh water living 
Explanation: Naegleria fowleri (brain eating amoeba) infection is commonly acquired by swimming in fresh water pond.Infective form- trophozoitesThey can penetrate the nasal mucosa and cribriform plate to produce a purulent meningitis and encephalitis that are usually rapidly fatal.