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
Amount of previously unrecognized disease which is diagnosed by screening effo, is - 
Select and explain. 
A. Yield, B. Sensitivity, C. Specificity, D. PPV
A: Yield
Answer: A: Yield 
Explanation: Ans. is `a' i.e., Yield Yield of the screening test: Is the amount of previously unrecognized disease that is diagnosed as result of screening effo. Yield of the screening test depends on: Sensitivity of screening test. Specificity of screening test. Prevalence of the disease in population. Paicipation of individuals in the detection programme. Yield of a screening test increases by: selecting high risk population for screening.