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': "CSF in meningococcal meningitis shows - \nSelect and explain. \nA. Gm '+ve' Diplococci, in pus cells, B. Gm '-ve' Diplococci in pus cells, C. Gm '-ve' bacilli, D. Gram '+ve' bacilli", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]