Correct Answer: C

Rationale: Oxygen therapy is prioritized to improve oxygenation in clients with pulmonary edema.

Correct Answer: D

Rationale: Pharyngeal efferent neurons are involved in head movement, including side-to-side motions.

Correct Answer: C

Rationale: Physical overexertion can contribute to an MS relapse, triggering symptoms to reappear.

Correct Answer: A

Rationale: The correct action specific to hormonal contraceptives that should be taught to the woman is that they alter cervical mucus to prevent sperm penetration. This mechanism helps in preventing pregnancy by reducing the chances of sperm reaching the egg. Choices B, C, and D are incorrect. Choice B is inaccurate as hormonal contraceptives work by inhibiting ovulation rather than increasing follicle-stimulating hormone release. Choice C is incorrect as hormonal contraceptives do not activate the maturation of the endometrial lining; instead, they modify it to prevent implantation. Choice D is also incorrect as hormonal contraceptives do not stimulate the pituitary gland to increase luteinizing hormone synthesis and release.

Correct Answer: B

Rationale: Sildenafil should not be used by patients taking nitrates, as the combination can lead to severe hypotension.