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 average number of fleas of each species per rodent called - 
Select and explain. 
A. General Flea index, B. Specific Flea index, C. Incidence of Fle species, D. Flea infestation Rate
B: Specific Flea index
Answer: B: Specific Flea index 
Explanation: <p> It is the average number of each species per rat/rodent. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:294. <\p>