This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pediatrics
Most common organism causing meningitis in a 1 year old child 
Select and explain. 
A. Streptococcus pneumoniae, B. H. influenza, C. Listeria, D. Neisseria meningitidIs
A: Streptococcus pneumoniae
Answer: A: Streptococcus pneumoniae 
Explanation: Streptococcus pneumonia is the most common organism causes meningitis even in the 1 year old child. Reference: GHAI Essential pediatrics, 8th edition