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': 'A 28 year old male presents with high fever, and signs suggestive of meningitis. On CSF microscopy, a gram-positive bacilli is seen. Organism is \nSelect and explain. \nA. S.pneumoniae, B. H.influenzae, C. Listeria, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Among the options only gram positve bacilli is Listeria.', 'role': 'assistant'}]