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': 'A doctor order 6 tests for SLE. Which of the follo wing is needed for inference? \nSelect and explain. \nA. Incidence of SLE and predictivity of each test, B. Prior probability of SLE, sensitivity and specificity of test, C. Incidence and prevalence of SLE, D. Relative risk of SLE in the patient', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • Post-test probability of a disease in a population (PTP) IS SAME AS PPV\n• Pre-test probability of a disease in a population (pTP) IS SAME AS Prevalence', 'role': 'assistant'}]