This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
[{'content': 'Organism causing meningitis between 6 m and 2 yrs. \nSelect and explain. \nA. H influenza, B. E. coli, C. Neisseriae, D. Pneumococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) H. influenzae # Meningitis:> Most serious disease produced by H. influenzae with case fatality rates up to 90 per cent in the untreated.> Bacilli reach the meninges from the nasopharynx through the bloodstream.> More common in children between two months and three years of age.> Age incidence has been correlated with the absence of bactericidal anti-PRP antibodies.> Older children develop immunity as a result of subclinical infection.> It has been reported that in the tropics, non-type b strains may be responsible for meningitis more often than in the temperate zones.', 'role': 'assistant'}]