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
Tumbling motility is shown by - 
Select and explain. 
A. Listeria monocytogenes, B. Proteus vulgaris, C. Borrelia, D. Clostridia
A: Listeria monocytogenes
Answer: A: Listeria monocytogenes 
Explanation: Listeria shows characteristic tumbling motility at 25 °C however, it is non motile at 37 °C.