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
[{'content': 'Predictive value of a positive test is defined as- \nSelect and explain. \nA. True+ve\\/true+ve+false-vex100, B. True + ve\\/ true + ve + false + ve x 100, C. False + ve \\/ true + ve + false + ve x 100, D. False + ve \\/ true + ve + false - ve x 100', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref:Parks 23rd edition pg 140 PPV = TP / (TP +FP) * 100 Predictive value reflects the diagnostic power of a test.', 'role': 'assistant'}]