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: Surgery
[{'content': 'Which is the commonest Post splenectomy infection- \nSelect and explain. \nA. Streptococcus pyogenes, B. Staphylococcus aureus, C. Streptococcus Pneumoniae, D. Pseudomonas aeruginosa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]