This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Spleen, Subject name: Surgery
[{'content': 'In post splenectomy the vaccine is used for following infection EXCEPT \nSelect and explain. \nA. Salmonella, B. H. influenzae, C. Strepto pneumonae, D. Meningococci', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Salmonella) (1092-93-LB) (666-CSDT1lth) (1110-B &L 25th)Postsplenectomv septicaemia - may result from Streptococcus pneumonia, N. meningitis, H. influenzae and E. coli* If elective splenectomy is planned, consideration should be given to vaccinating against pneumococcus, H. influenzae and meningococcus.* In general, splenectomy should be deferred until age 6 unless the hematologic problem is especially severe.', 'role': 'assistant'}]