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': "Prozone phenomenon is a feature is- \nSelect and explain. \nA. Tularemia, B. Legionnaires' disease, C. Plague, D. Brucellosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]