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
[{'content': 'Post-splenectomy, the patient is in need of ______ vaccination \nSelect and explain. \nA. Pneumococcal, B. Rota virus, C. BCG, D. MMR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]