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': 'What is the average number of fleas of each species per rodent called - \nSelect and explain. \nA. General Flea index, B. Specific Flea index, C. Incidence of Fle species, D. Flea infestation Rate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <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>', 'role': 'assistant'}]