问题
单项选择题
A client asks the nurse what PSA is. The nurse should reply that it stands for（）
A. prostate-specific antigen, used to screen for prostate cancer.
B. protein serum antigen, used to determine protein levels.
C. pneumococcal strep antigen, a bacteria that causes pneumonia.
D. papanicolaou-specific antigen, used to screen for cervical cancer.
答案
参考答案：A
解析：
PSA stands for prostate-specific antigen, which is used to screen for prostate cancer.