Which medication is commonly used in hormone therapy for masculine pattern hair growth in women?

Spironolactone is commonly used in hormone therapy for treating conditions related to androgen excess in women, including masculine pattern hair growth (also known as hirsutism). This medication functions as an anti-androgen, effectively blocking the effects of male hormones such as testosterone at the hair follicle level. By reducing these androgen effects, spironolactone helps to decrease excessive hair growth and can also improve the overall appearance of the skin in women suffering from this condition.

The other medications listed serve different purposes or have different mechanisms. Finasteride, while also an anti-androgen, is primarily prescribed for male pattern baldness and benign prostatic hyperplasia, and its use in women is limited and often not recommended. Estrogen and progesterone are hormones involved in female reproductive health but do not have the same direct anti-androgenic effects needed to address masculine pattern hair growth. Therefore, spironolactone is the most effective choice in this context, making it the correct answer.