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
[{'content': 'All are true about listeria except: \nSelect and explain. \nA. Gram positive, B. PALCAM agar is used for isolation, C. Characteristic tumbling motility at 37degC, D. Umbrella shaped growth', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is. 'c' i. e., Characteristic tumbling motility at 37degC", 'role': 'assistant'}]