This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vibrio, Subject name: Microbiology
Which of the following contains single flagella? 
Select and explain. 
A. Treponema Pallidum, B. Escherichia Coli, C. Vibrio cholera, D. Heliobacter Pylori
C: Vibrio cholera
Answer: C: Vibrio cholera 
Explanation: Ans. (c) Vibrio choleraeRef: Microbiology by Ananthanarayan and Paniker 8th ed. /302-305* Vibrio Cholerae is the organism with a single flagellum. Bacteria with a single flagellum are called monotrichous. Lophotrichous bacteria have multiple flagella located at the same end of the the bacteria (or a few sites) such as Helicobacter Pylori.* Endoflagella are spirochetes flagella which is not external to the bacteria but present within the cell from end to end of the cell providing rigidity to the cell and giving it the corkscrew movement.Amphitrichous bacteriaA. fecalisPeritrichous bacteriaE. ColiEndoflagellaSpirochetes