The 70-year-old woman who is considering coming off hormone replacement therapy (HRT) for the reduction of postmenopausal discomfort asks the nurse what advantage is offered by tamoxifen, also called a "designer estrogen." The nurse's best response is that tamoxifen:
A - provides estrogen to some tissues while acting as an antiestrogen to others.
B - has no side effects.
C - needs to be taken only once a week.
D - improves the skin turgor and complexion.