An increased level of ________ indicates prostate disease or possibly prostate cancer.

A) fluorescent treponemal antibody
B) prostate-specific antigen
C) semen
D) testosterone

Prostate-specific antigen (PSA) is a protein produced by the prostate gland. An increased level of PSA in the blood can indicate prostate disease or possibly prostate cancer. Fluorescent treponemal antibody is a blood test used to diagnose syphilis, semen is not typically used as a diagnostic tool, and testosterone levels can be used to diagnose hormonal imbalances but do not specifically indicate prostate disease.