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
Most common post splenectomy infection is: 
Select and explain. 
A. Pneumococcus, B. Meningococcus, C. Staphy lococcus, D. Corynebacterium
A: Pneumococcus
Answer: A: Pneumococcus 
Explanation: Pneumococcus