**Core Concept:** Hormone replacement therapy (HRT) is a common therapeutic approach for treating menopausal symptoms in postmenopausal women. HRT typically includes estrogen and progesterone, or just estrogen in cases without a functioning uterus. HRT aims to maintain or restore hormonal balance after menopause, which can alleviate symptoms such as hot flashes, night sweats, vaginal dryness, and bone loss.

**Why the Correct Answer is Right:** In postmenopausal women, the correct answer is **D.** Estrogen-only therapy. HRT with estrogen and progesterone (options A and B) carries a higher risk of adverse effects, particularly due to the progesterone component. Progesterone can increase the risk of cardiovascular events (myocardial infarction, stroke, and venous thromboembolism) due to its pro-thrombotic effects.

**Why Each Wrong Option is Incorrect:**

A. Estrogen-only therapy is less effective in treating vasomotor symptoms and urogenital atrophy compared to combined therapy (estrogen plus progesterone).
B. Combined hormonal therapy is more beneficial in preventing osteoporosis and reducing the risk of fractures than estrogen-only therapy.
C. Hormone replacement therapy is universally safe and beneficial for all postmenopausal women.

**Clinical Pearl:** In postmenopausal women, estrogen monotherapy (option D) is often preferred over estrogen-progesterone combination therapy (options A and B) due to the increased cardiovascular risks associated with progesterone. However, individualized patient assessments and discussions regarding potential risks and benefits are crucial when considering HRT for postmenopausal women.