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': 'Population is 10,000, of these 20% having disease. The screening test has 95% sensitivity and 80% specificity. PPV is - \nSelect and explain. \nA. 54.30%, B. 98.50%, C. 47.50%, D. 20%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In this question\nSensitivity = 95%\nSpecificity = 80%', 'role': 'assistant'}]