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': 'Brazilian purpuric fever is caused by: \nSelect and explain. \nA. Bordetella peussis, B. Haemophilus aegypticus, C. Haemophilus duceryi, D. Haemophilus parinfluenzae', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., Haemophilus aegypticus", 'role': 'assistant'}]