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': 'Most sensitive indicator of recent transmission of malaria of - \nSelect and explain. \nA. Infant parasite rate, B. ABER, C. Spleen rate, D. Annual parasite index', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> Infant parasite rate. It is the percentage of infants below age of 1 year showing malaria parasites in their blood films. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:261. <\\p>', 'role': 'assistant'}]