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 patient is in need of '______________vaccination - \nSelect and explain. \nA. Pneumococcal, B. Rota virus, C. BCG, D. MMR", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pneumococcal", 'role': 'assistant'}]