The nurse is speaking to a group of women about early detection of breast cancer. The average age of the women in the group is 47. Following the American Cancer Society (ACS) guidelines, the nurse should recommend that the women（）
A. perform breast self-examination annually.
B. have a mammogram annually.
C. have a hormonal receptor assay annually.
D. have a physician conduct a clinical examination every 2 years.
参考答案：B
解析：
According to the ACS guidelines, "Women older than age 40 should have a mammogram annually and a clinical examination at least annually (not every 2 years); all women should perform breast self-examination monthly (not annually). " The hormonal receptor assay is clone on a known breast tumor to determine whether the tumor is estrogen- or progesterone-dependent.