This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Definition and Concepts, Examples from NHPs, Subject name: Social & Preventive Medicine
Which is the most economical and best screening method? 
Select and explain. 
A. Mass screening, B. High risk screening, C. Multiphasic screening, D. None of the above
B: High risk screening
Answer: B: High risk screening 
Explanation: High risk screening: In High risk screening,besides effectiveness,economical use of resources is also seen as screening tests are selectively applied to individuals in high risk groups High risk selective screening gives maximum yield. E.g. HIV screening in commercial sex workers Therefore it is the most economical and best screening method.