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 2 years old child is brought to the emergency with history of fever and vomiting. On examination he has neck rigidity. The CSF examination shows polymorphs more that 2000/ml protein 100 mg/dl and glucose 10mg/dl. The Gram stain shows the presence of Gram negative coccobacilli. The culture shows growth of bacteria only on chocolate agar and not on blood agar. The causative agent is - \nSelect and explain. \nA. Neisseria meningitidis, B. Haemophilus influenzae, C. Branhamella catarrhalis, D. Legionella pneumophila', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]