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': 'Gram (+)ve bacilli causing meningitis: \nSelect and explain. \nA. Pneumococci, B. Listeria, C. E. coli, D. Meningococci', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) i.e. Listeria', 'role': 'assistant'}]