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
The best indicator for a potential explosiveness of plague outbreak is- 
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: Question repeated