This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'True statement regarding Japanese Encephalitis is \nSelect and explain. \nA. Epidemic is declared if there are 2-3 cases in a village, B. 70% of cases are reported from infants, C. Ratio of clinical apparent to non-apparent infections is 1:100, D. Mosquito bite is always associated with the disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • 85% of cases of JE are reported in age below 15 years BUT JE IS INFREQUENT IN INFANCY: Vaccination not recommended below 6 months age infants (as also interference from maternal antibodies)\n• Not all humans bitten by mosquitoes develop the disease: Ratio of JE overt disease to inapparent infection varies from 1:300 to 1:1000\n• Endemicity of JE in India: 1-2 cases per village', 'role': 'assistant'}]