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
[{'content': 'ELISA test has sensitivity of 95% and specificity of 95%. Prevalence of HIV carriers is 5%. The predictive value of positive test is- \nSelect and explain. \nA. 95%, B. 50%, C. 100%, D. 75%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 50%", 'role': 'assistant'}]