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
Population is 10,000. Of these 20% is having disease. The screening test has 95% sensitivity and 80% specificity. PPV is- 
Select and explain. 
A. 54.3%`, B. 98.50%, C. 47.50%, D. 20%
A: 54.3%`
Answer: A: 54.3%` 
Explanation: Ref:Parks 23rd edition pg 139 Construct a 2x2 table using the above data. 1900 1600 100 6400 PPV = TP / (TP +FP) = 1900/ (1900+1600) =54.3