**Question:** Oral contraceptive pill of choice in a lactating woman is:

A. Ethinyl estradiol and levonorgestrel (Levonorgestrel-releasing intrauterine device [LNG-IUD])
B. Ethinyl estradiol and desogestrel
C. Ethinyl estradiol and norgestimate
D. Ethinyl estradiol and gestodene

**Core Concept:**
Oral contraceptives are a class of medications primarily composed of estrogen and progestin hormones. These hormones work together to prevent ovulation and implantation by altering the cervical mucus and uterine lining, making it difficult for sperm to reach the uterus and fertilize the egg. In lactating women, a combination of estrogen and progestin is preferred due to reduced systemic exposure to hormones, minimizing systemic side effects.

**Why the Correct Answer is Right:**
The correct answer (A) is chosen due to the combination of ethinyl estradiol and levonorgestrel, which is frequently used as the LNG-IUD. This type of contraceptive ensures minimal systemic absorption, making it suitable for lactating women. Levonorgestrel is a progestin with minimal effect on prolactin levels and breast milk production, thus reducing the risk of side effects in lactation and making it a safer choice.

**Why Each Wrong Option is Incorrect:**

Option B (ethinyl estradiol and desogestrel) is incorrect because desogestrel is a third-generation progestin, which is more potent in suppressing lactation and could potentially interfere with breast milk production. This option increases the risk of side effects on lactation and is less preferred compared to ethinyl estradiol and levonorgestrel.

Option C (ethinyl estradiol and norgestimate) is incorrect as norgestimate is a third-generation progestin, similar to desogestrel, which could negatively affect lactation. This option also increases the risk of side effects on lactation and is less preferred compared to ethinyl estradiol and levonorgestrel.

Option D (ethinyl estradiol and gestodene) is incorrect as gestodene is a third-generation progestin with potential interference in lactation. This option increases the risk of side effects on lactation and is less preferred compared to ethinyl estradiol and levonorgestrel.

**Clinical Pearls:**

1. In lactating women, the choice of oral contraceptive should be based on the least potent progestin to minimize side effects on lactation.
2. Ethinyl estradiol combined with levonorgestrel is often chosen as it is a second-generation progestin, which has minimal effect on lactation and is considered safer than third-generation progestins like desogestrel, norgestimate, and gestodene.
3. The combination of ethinyl estradiol and levonorgestrel is generally more suitable for lactating mothers seeking contraception due to its lesser impact on lactation and reduced risk of side effects in comparison to the other options.