The Health Care Provider Orders a Blood Test for Prostate-Specific

The health care provider orders a blood test for prostate-specific antigen (PSA) when an enlarged prostate is palpated during a routine examination of a 56-year-old man. When the patient asks the nurse the purpose of the test, the nurse's response is based on the knowledge that

A) elevated levels of PSA are indicative of metastatic cancer of the prostate.
B) PSA testing is the "gold standard" for making a diagnosis of prostate cancer.
C) baseline PSA levels are necessary to determine whether treatment is effective.
D) PSA levels are usually elevated in patients with cancer of the prostate.