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': 'The most sensitive index for surveillance of malaria transmission is - \nSelect and explain. \nA. Spleen rate, B. Parasite density index, C. Infant parasite rate, D. Propoional case rate', 'role': 'user'}, {'content': "Answer: C \nExplanation: - infant parasite rate is defined as the percentage of infants below the age of one year showing malaria parasites in their blood films. - It is regarded as the most sensitive index of transmission of malaria in a locality. Reference : Park's textbook of preventive and social medicine, 23rd edition pg no: 261 <\\p>", 'role': 'assistant'}]