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