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
The most common organism causing meningitis is- 
Select and explain. 
A. Staphylococcus, B. Streptococcus, C. Mycoplasma, D. Pneumococcus
D: Pneumococcus
Answer: D: Pneumococcus 
Explanation: None