A Patient with Prostate Cancer Asks the Nurse the Meaning

A patient with prostate cancer asks the nurse the meaning of his high prostate-specific antigen (PSA) level. Which response by the nurse is correct?

A) "PSA is a tumor marker that is elevated in patients with prostate cancer."
B) "PSA levels are done routinely to determine whether your prostate cancer has spread to a new site."
C) "The doctor orders PSA measurements to monitor the level of chemotherapy medication in your blood."
D) "A PSA test allows the pathologist to view the cancer cells under the microscope to monitor the progression of cancer."