This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Patients undergoing splenectomy require following vaccinations except \nSelect and explain. \nA. Pneumococcus, B. Gonococcus, C. Haemophilus, D. Influenza', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Postsplenectomy septicaemia may result from Streptococcus pneumoniae, Neisseria meningitides, Haemophilus influenzae and Escherichia coli. (Oppounist post-splenectomy infection (OPSI))If elective splenectomy is planned, consideration should be given to vaccinating against pneumococcus, meningococcus C (both repeated every 5 years) and H. influenzae type B (Hib) (repeated every 10 years).Ref: Bailey and love 27e pg: 1187', 'role': 'assistant'}]