Correct Answer: A

Rationale: The correct answer is A: Tamoxifen may increase the risk of venous thromboembolism. Patients on tamoxifen should be educated about the signs and symptoms of blood clots. Choices B, C, and D are incorrect. Tamoxifen does not decrease the risk of osteoporosis; it may cause hot flashes and other menopausal symptoms, and it may cause weight gain and fluid retention.

Correct Answer: A

Rationale: The correct answer is A. Tamoxifen increases the risk of venous thromboembolism, so patients should be educated about the signs and symptoms of blood clots. Choice B is incorrect because tamoxifen does not decrease the risk of osteoporosis. Choice C is incorrect as tamoxifen may cause hot flashes and other menopausal symptoms but this is not the critical point for patient education. Choice D is incorrect as tamoxifen may cause weight gain and fluid retention, but it is not the critical point that the nurse should focus on in patient education.

Correct Answer: A

Rationale: The correct instruction is to apply testosterone gel after showering and allow it to dry completely before dressing. This helps prevent the transfer of the gel to others and ensures proper absorption. Choice B is incorrect because the gel should not be applied to the genitals. Choice C is incorrect as there is no specific benefit to applying the gel before bedtime. Choice D is incorrect as the gel should not be applied to the face and neck for the treatment of hypogonadism.

Correct Answer: D

Rationale: Neutrophils are the correct answer as they are the predominant phagocytes arriving early at inflammatory and infection sites. Neutrophils are part of the body's innate immune system and are among the first responders to sites of inflammation or infection. They play a crucial role in engulfing and destroying pathogens. Macrophages, although important phagocytes, usually arrive later at the site. Mast cells are involved in allergic reactions and not primarily phagocytes. Monocytes are precursors to macrophages and are not the predominant phagocytes arriving early at inflammatory sites.

Correct Answer: B

Rationale: The primary role of cytokines in maintaining homeostasis is to perform a regulatory function in the development of diverse blood cells. Cytokines act as signaling molecules that regulate the immune response and hematopoiesis. Choice A is incorrect because cytokines do not perform phagocytosis; they regulate immune responses. Choice C is incorrect because while cytokines are involved in the formation of some blood cells, they are not considered the basic 'building blocks' of all blood cells. Choice D is incorrect because cytokines are not formed in response to antibodies, but rather play a role in the immune response to various stimuli.