This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
What is the best indicator for a potential explosiveness of plague outbreak? 
Select and explain. 
A. Total flea index, B. Cheopis index, C. Specific percentage of fleas, D. Burrow index
B: Cheopis index
Answer: B: Cheopis index 
Explanation: - cheopis index is the average number of Xenopsylla cheopis per rat. - most significant than total flea index. -it is the best indicator for a potential explosiveness of plague outbreak. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:294 <\p>