A nurse is teaching a client who is prescribed COCs about the mechanism of action of these pills.

The nurse should explain that COCs prevent pregnancy by?

The correct answer is choice A.COCs can reduce the risk of endometrial, ovarian and colon cancer.This is because COCs suppress ovulation and reduce inflammation in the genital tract, which may lower the exposure to carcinogens and mutagens.

Choice B is wrong because COCs do not increase bone density or prevent osteoporosis.In fact, some studies have suggested that COCs may have a negative effect on bone mineral density.

Choice C is wrong because COCs do not enhance fertility or improve menstrual regularity.

COCs prevent pregnancy by inhibiting ovulation, which means that they temporarily suppress fertility.COCs may also cause irregular bleeding or amenorrhea in some women.

Choice D is wrong because COCs do not lower blood pressure or cholesterol levels.On the contrary, COCs may increase the risk of hypertension and dyslipidemia in some women, especially those who smoke, are obese, or have a family history of cardiovascular disease.

The correct answer is choice B. The client has a positive pregnancy test result.

This is a contraindication for bilateral tubal ligation because the procedure is a permanent form of contraception and should not be performed on a pregnant woman.

The client should be counseled about other options for birth control or termination of pregnancy.

Choice A is wrong because a history of pelvic inflammatory disease is not a contraindication for bilateral tubal ligation.It may increase the risk of complications from the surgery, such as infection or adhesions, but it does not prevent the procedure from being performed.

Choice C is wrong because a family history of breast cancer is not a contraindication for bilateral tubal ligation.It may affect the client’s decision to undergo the procedure, as some studies have suggested that tubal ligation may reduce the risk of ovarian cancer, which is associated with breast cancer.

However, this is not a medical reason to avoid the surgery.

Choice D is wrong because a history of endometriosis is not a contraindication for bilateral tubal ligation.

It may cause pelvic pain or infertility, but it does not affect the effectiveness or safety of the procedure.In fact, some studies have shown that tubal ligation may improve the symptoms of endometriosis by reducing retrograde menstruation.