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
Microorganism motile at 25deg C but not motile at 37deg C- 
Select and explain. 
A. Listeria monocytogens, B. Campylobacter, C. Yersinia pestis, D. Streptococcus agalctiae
A: Listeria monocytogens
Answer: A: Listeria monocytogens 
Explanation: Ans. is 'a' i.e., Listeria monocytogens Listeria monocytogens exhibits characteristic, slow, tumbling motility when grown at 25degC but at 37degC it is non motile.