Final answer:
The mini-pill, which contains only progesterone, differs from the options provided: Brevicon is a combined pill, Nexplanon an implant, Ogen estrogen therapy, and Depo-Provera an injectable form of contraception. The correct example of the mini-pill oral contraceptive wasn't listed among the provided options.
Step-by-step explanation:
Hormonal Contraceptive: The Mini-Pill
The mini-pill is a type of oral contraceptive that is often referred to as the progesterone-only pill. Unlike the combined pill, which contains both estrogen and progesterone, the mini-pill contains only progesterone. This hormonal contraceptive is effective in preventing pregnancy mainly by thickening the cervical mucus to prevent sperm from entering the uterus and by altering the lining of the uterus to prevent implantation of a fertilized egg.
Among the options provided in the question, Depo-Provera is an example of an injectable form of contraception that contains progestin, making it different from the mini-pill. Depo-Provera - the birth control shot - is administered every 3 months and is not an oral contraceptive. Therefore, the correct answer to the question is none of the options listed, as the mini-pill itself was not among the choices.
To provide additional context, Brevicon is a combined oral contraceptive, Nexplanon is an implant, and Ogen is a form of estrogen therapy, none of which are mini-pills. Other birth control options include barrier methods like condoms, hormonal patches, vaginal rings, intrauterine devices, and sterilization methods, each with different levels of effectiveness and modes of action.