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
If prevalence of a disease increases, what is true- 
Select and explain. 
A. PPV increases, B. PPV decreases, C. No effect on PPV, D. Prevalence is more in A
A: PPV increases
Answer: A: PPV increases 
Explanation: Ref:Parks 25th edition pg 153. Positive predictive value depends on prevalence : Note : PPV increases as prevalence increases. PPV decreases as prevalence decreases. But sensitivity and specificity is independent of prevalence.