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
All are true about listeria except: 
Select and explain. 
A. Gram positive, B. PALCAM agar is used for isolation, C. Characteristic tumbling motility at 37degC, D. Umbrella shaped growth
C: Characteristic tumbling motility at 37degC
Answer: C: Characteristic tumbling motility at 37degC 
Explanation: Ans. is. 'c' i. e., Characteristic tumbling motility at 37degC