This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Indicator for the outbreak of Plague epidemic is \nSelect and explain. \nA. Rat burrow index, B. Total flea, C. Specific flea index, D. Cheopis index', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cheopis index: It is an average no of X.cheopis per rat. It is a specific flea index. If this index is more than 1, it is regarded as indicative of potential explosiveness of the situation, should a plague outbreak occur', 'role': 'assistant'}]