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 lady presented with, headache, kernigs sign positive, culture showed gram positive bacilli, most probable organism is: \nSelect and explain. \nA. Listeria monocytogenes, B. H. influenza, C. Meningococci, D. Streptococcus pneumoniae', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) i.e. Listeria monocytogenes Among options provided listeria is the only Gr positive bacilli. Listeria accounts for 10% of cases of community acquired bacterial meningitis. For details see previous answers.', 'role': 'assistant'}]