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': 'If the objective of the investigator is to assess the incidence of tuberculosis infection in a community, the most appropriate methodology would be to- \nSelect and explain. \nA. Identify all individuals with positive tuberculin test, B. Perform sputum examination of chest symtomatics, C. Identify new conveers to Tuberculin test, D. Screen all under-five children with Tuberculin test', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Identify new conveers to tuberculin test Incidence of infection o It is the percentage of population under study who will be newly infected by mycobacterium tuberculosis among the non infected of the preceding survey during the course of one year . o Persons newly infected with mycobacterium T.B. can be easily detected by new conveors to tuberculin test (remember positive tuberculin test indicates that the person is infected with M Tuberculosis); it does not prove that the person is suffering from disease. o Therefore the incidence of infection is also called "Tuberculin conversion index". o This parameter is considered one of the best indicators for evaluating the tuberculosis problem and its trend.', 'role': 'assistant'}]