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: Medicine
[{'content': 'Vaccine against capsulated organism given how many weeks before splenectomy ? \nSelect and explain. \nA. 1 week, B. 2 week, C. 4 week, D. 6 week', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. 2 weekPneumococcal polysaccharide (PPSV) vaccination; If elective splenectomy is planned, vaccinate at least 2 weeks before surgery.', 'role': 'assistant'}]