Final answer:
The OCP approved for treating PMS is Drospirenone. It is a synthetic progestin used in combination with ethynyl estradiol in birth control pills, which also helps manage menstrual cycles and alleviate PMS symptoms.
Step-by-step explanation:
The oral contraceptive pill (OCP) approved to treat premenstrual syndrome (PMS) is b) Drospirenone. This synthetic progestin, when combined with ethynyl estradiol, is found in certain birth control formulations and is known to be effective in the management of PMS. While OCPs mimic the natural hormones in the body to prevent ovulation, they can come with side effects such as weight gain and an increased risk of blood clots. Nonetheless, they can play a significant role in regulating menstrual cycles and alleviating PMS symptoms.