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': 'Risk of pneumococcal meningitis is seen in - \nSelect and explain. \nA. Post splenectomy patient, B. Patient undergone neurosurgical intervention, C. Patient following cardiac surgery, D. Patient with hypoplasia of lung', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]