This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sensitivity, Specificity, PPV, NPV, Subject name: Social & Preventive Medicine
[{'content': 'A diagnostic test for a paicular disease has a sensitivity of 0.90 and a specificity of 0.90. A single test is applied to each subject in the population in which the diseased population is 10%. What is the probability that a person positive to this test, has the disease? \nSelect and explain. \nA. 90%, B. 81%, C. 50%, D. 91%', 'role': 'user'}, {'content': "Answer: C \nExplanation: BAYES' THEORM In the given question, Sensitivity=0.90=90% Specificity=0.90=90% Prevalence=10% PPV = (Sensitivity*Prevalence)/ + * 100 Thus, PPV=90*10/ + *100 = 50%(0.50)", 'role': 'assistant'}]