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
A 2 years old child is brought to the emergency with history of fever and vomiting. On examination he has neck rigidity. CSF examination shows polymorphs more than 200 /ml; protein 100 mg/dl and glucose 10 mg/dl. the Gram's stain shows the presence of Gram-negative coccobacilli. The culture shows of bacteria only on chocolate. Agar and not on blood agar. The causative agent is: 
Select and explain. 
A. Neisseria meningitidis, B. Haemophilus influenzae, C. Branhatnella catarrhalis, D. Legionella pneuntophila
B: Haemophilus influenzae
Answer: B: Haemophilus influenzae 
Explanation: Ans. (b) H. influenzae See the morphology of asked bacteria, you will know the answer. H. influenzae - Gram-negative coccobacilli N. meningitidis - Gram-negative cocci Legionella - Gram-negative coccobacilli B. catarrhalis - Gram-negative cocci