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: Pediatrics
Most common organism causing meningitis in a 1 year old child is: 
Select and explain. 
A. Streptococcus pneumoniae, B. H. influenza, C. Listeria, D. Neisseria meningitidis
A: Streptococcus pneumoniae
Answer: A: Streptococcus pneumoniae 
Explanation: The common organisms causing acute bacterial meningitis in the neonatal period are E.coli, Streptococcus pneumonia, Salmonella species, Pseudomonas aeruoginosa, Streptococcus fecalis and Staphylococcus aureus. Ref: Ghai Essential Pediatris - 6th Edition, Page 517; Nelson 17th Edition, Page 2308.