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': 'Amount of previously unrecognized disease which is diagnosed by screening effort, is - \nSelect and explain. \nA. Yield, B. Sensitivity, C. Specificity, D. PPV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Yield of the screening test: Is the amount of previously unrecognized disease that is diagnosed as a result of screening effort.\nYield of the screening test depends on:\nSensitivity of screening test.\nSpecificity of screening test.\nPrevalence of the disease in population.\nParticipation of individuals in the detection programme.\nYield of a screening test increases by: selecting high risk population for screening.', 'role': 'assistant'}]