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
More false positive cases in a community signify that the disease has 
Select and explain. 
A. High sensitivity, B. High specificity, C. community has high prevalence, D. community has low prevalence
D: community has low prevalence
Answer: D: community has low prevalence 
Explanation: Ref:Parks 23rd edition pg 138 Low prevalence gives more false positive test results. Note : PPV increases as prevalence increases. PPV decreases as prevalence decreases.