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
ELISA test has sensitivity of 95% and specificity of 95%. Prevalence of HIV carriers is 5%. The predictive value of positive test is- 
Select and explain. 
A. 95%, B. 50%, C. 100%, D. 75%
B: 50%
Answer: B: 50% 
Explanation: Ans. is 'b' i.e., 50%