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': 'Brain abscess in immunodeficient person is due to : \nSelect and explain. \nA. Cryptococcus, B. Staphylococcus, C. Pneumococcus, D. E. coli', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Cryptococcus', 'role': 'assistant'}]