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
[{'content': 'Cheopis Index used for \nSelect and explain. \nA. Rabies, B. Plague, C. Yellow fever, D. Leishmaniasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Flea indices Flea indices are useful measurements of the density of fleas. they are also useful in evaluating the effectiveness of a spraying programme.The following flea indices are widely used in rat flea surveysTotal flea indexCheopis indexSpecific percentage of fleasBurrow indexRef: Park; 23rd ed; Pg.no: 294', 'role': 'assistant'}]