This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
The amount of previously inrecognised disease that is diagnosed as a result of the creening effor is known as - 
Select and explain. 
A. Predictive accuracy, B. Reliability, C. Yield, D. Validity
C: Yield
Answer: C: Yield 
Explanation: .<p>yield is the amount of previously unrecognised disease that is diagnosed as a result of the screening effo .it depends upon the sensitivity,specificity, and prevalence of the disease.selection of high risk populations helps to increase the yield.</p><p>ref:park&;s textbook of preventive and social medicine,22 nd edition,pg no127</p>