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
Population is 10,000, of these 20% having disease. The screening test has 95% sensitivity and 80% specificity. PPV is - 
Select and explain. 
A. 54.30%, B. 98.50%, C. 47.50%, D. 20%
A: 54.30%
Answer: A: 54.30% 
Explanation: In this question
Sensitivity = 95%
Specificity = 80%