What is the specificity of the PSA screening test? O a. 10% O b. 15% O c. 20% O d. 53%Display for questions 17 - 20. The PSA blood test is typically used to screen for prostate cancer, Typically, PSA levels are low in the absence of disease, and highly elevated when prostate cancer is present. A prostate biopsy provides the definitive diagnosis, and is considered the gold standard. The table below shows the results of a study that compared PSA levels to prostate biopsy results. Biopsy Result (Gold Standard) PSA Level (Screening Test) Prostate Cancer No Prostate Cancer Totals Highly Elevated (> 29 ng/ml) 10 40 50 Low (0-2.5 ng/ml) 5 45 50 15 85 100 What is the prevalence of the disease? O a. 15% b. 20% O c. 10%% O d. 85%What is the positive predictive value (PPV) of the PSA screening test? a. 10% O b. 15% c. 20% O d. 90%What is the sensitivity of the PSA screening test? O a. 33% O b. 53% O c. 67% O d. 85%