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': 'The drug of choice for chemoprophylaxis in contacts of a patient of pneumonic plague is - \nSelect and explain. \nA. Penicillin., B. Rifampicin, C. Erythromycin, D. Tetracycline', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]