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
Most number of false positives by a screening test is because of?a)  High specificityb)  High sensitivityc)  High prevalenced)  Low prevalence 
Select and explain. 
A. c, B. d, C. ab, D. bd
D: bd
Answer: D: bd 
Explanation: If a population has more false positive cases : -


Screening test is more sensitive
Positive predictive value of the test is low.
Prevalence of disease is low.



If a population has more false negative cases

i)   Screening test is more specific
ii)  Negative predictive value of the test is low