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
If prevalence of a disease increases, what is true? 
Select and explain. 
A. PPV increases, B. PPV decreases, C. No effect on PPV, D. PPV may increase or decrease
A: PPV increases
Answer: A: PPV increases 
Explanation: Ans. is 'a' i.e., PPV increase