Final answer:
Estradiol and Conjugated estrogens are available in vaginal application forms, commonly as creams or tablets, which can be used for indications like atrophic vaginitis and hormone replacement therapy. Ethinyl estradiol is typically used orally for birth control.B. Conjugated estrogens
Step-by-step explanation:
The estrogens that come in vaginal application form include Estradiol and Conjugated estrogens. Estradiol can be used vaginally in various forms such as creams, tablets, and rings for different indications including atrophic vaginitis and as part of hormone replacement therapy. Conjugated estrogens are also available for vaginal application and are used for similar indications. Estriol is another form of estrogen which has been used in vaginal cream form in some countries. However, Ethinyl estradiol, which is a synthetic estrogen, is commonly used in oral contraceptive pills and typically not used for vaginal administration as it is more potent and usually delivered systemically for birth control purposes.