Correct Answer: B

Rationale: The correct answer is B. Cerebrospinal fluid primarily cushions the brain and spinal cord, protecting them from injury.
Choice A is incorrect because while CSF contributes to the brain's immune environment, its main role is not providing immune protection as a physical barrier.
Choice C is incorrect because CSF has a significant role in the exchange of nutrients and waste products, rather than a limited one.
Choice D is incorrect as CSF is not primarily a medium for nerve impulse transmission, but rather serves as a protective and supportive fluid.

Correct Answer: C

Rationale: The correct answer is bone density testing (
Choice
C). Long-term use of Depo Provera, a hormonal contraceptive, is associated with decreased bone mineral density. Assessing bone density is crucial to monitor for potential osteoporosis. Cardiac stress testing (
Choice
A) is not indicated based on the medication history provided. Renal ultrasound (
Choice
B) and evaluation of triglyceride levels (
Choice
D) are not directly related to the use of Depo Provera.

Correct Answer: C

Rationale: After the administration of interferon alfa-2b, the patient may develop flu-like symptoms as an adverse effect. Flu-like symptoms are commonly associated with interferon therapy, including fever, chills, fatigue, and muscle aches. These symptoms usually subside over time. Options A, B, and D are not typically associated with interferon alfa-2b administration. Profound diaphoresis is excessive sweating, decreased level of consciousness indicates neurological issues, and cyanosis and pallor suggest circulatory or respiratory problems, none of which are expected adverse effects of interferon alfa-2b.

Correct Answer: C

Rationale: The correct answer is C. Oral contraceptives can be less effective when taken with certain antibiotics as they may interfere with the contraceptive's efficacy, potentially leading to decreased effectiveness.
Therefore, patients should be advised to use additional contraception methods if they are also taking antibiotics.
Choice A is incorrect because while oral contraceptives are highly effective, they are not 100% foolproof.
Choice B is incorrect as oral contraceptives may take some time to reach their full effectiveness after starting.
Choice D is incorrect since taking oral contraceptives with food does not necessarily impact their effectiveness.

Correct Answer: A

Rationale: The critical point the nurse should include in patient education for a patient prescribed tamoxifen is that it may increase the risk of venous thromboembolism. This is crucial information because tamoxifen is known to promote blood clot formation, and patients need to be aware of the signs and symptoms of blood clots to seek prompt medical attention.

Choices B, C, and D are incorrect as tamoxifen is not associated with decreasing the risk of osteoporosis, causing hot flashes and other menopausal symptoms, or directly causing weight gain and fluid retention.