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': 'All of the following statements are false regarding plague, except \nSelect and explain. \nA. Live attenuated vaccine are used, B. Septicemic Plague is highly infectious, C. Vaccine is not used to control epidemic of pneumonic plague, D. Most impoant measure to control epidemic is rodent control', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vaccine is not effective in pneumonic plague.', 'role': 'assistant'}]