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': 'Characteristic infection of nocardia asteroides is? \nSelect and explain. \nA. Colonic diverticula, B. Brain abscess, C. Secondary dissemination to liver, D. Diarrhoea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]