Correct Answer: D

Rationale: The correct answer is to monitor for signs of dehydration. Hydrochlorothiazide is a diuretic that can lead to fluid loss and dehydration. The client should be educated to watch for symptoms like dry mouth, increased thirst, weakness, dizziness, and decreased urine output. Prompt recognition of dehydration signs is crucial for timely intervention and prevention of complications. Choices A, B, and C are incorrect. Taking Hydrochlorothiazide in the morning is not a specific instruction for this medication. While potassium-rich foods can be important when taking certain medications, it is not the priority instruction for Hydrochlorothiazide. Taking this medication with food may help reduce stomach upset but is not the most critical instruction for a diuretic like Hydrochlorothiazide.

Correct Answer: C

Rationale: A temperature of 38.1°C (100.6°F) can indicate an infection, which is considered an oncologic emergency in clients receiving chemotherapy due to the increased risk of sepsis in immunocompromised individuals. Dry oral mucous membranes (Choice A), nausea and vomiting (Choice B), and anorexia (Choice D) are common side effects of chemotherapy but do not typically indicate an oncologic emergency requiring immediate intervention.

Correct Answer: A

Rationale: Dexamethasone, a glucocorticoid, is indicated for clients with brain cancer to decrease inflammation and swelling. It helps reduce cerebral edema and relieve pressure caused by the tumor, ultimately alleviating headaches. The purpose of prescribing dexamethasone in this case is not to improve concentration (choice B), induce sedation (choice C), or treat depression (choice D). Methylphenidate, a stimulant, is used for conditions like ADHD, not for brain cancer. Hydroxyzine, an antihistamine, is primarily used for anxiety and itching, not for brain cancer. Amitriptyline, a tricyclic antidepressant, is used for conditions like depression and neuropathic pain, not specifically for brain cancer-related headaches.

Correct Answer: A

Rationale: Constipation is a common adverse effect of Verapamil, a calcium channel blocker. Verapamil can slow down bowel movements and lead to constipation as a side effect. Therefore, the client reporting frequent constipation should alert the nurse to a potential adverse effect of Verapamil. Choices B, C, and D are not typically associated with Verapamil use. Increased urination is not a common side effect of Verapamil, peeling skin is more likely related to a dermatological issue, and ringing in the ears is not a known adverse effect of Verapamil.

Correct Answer: A

Rationale: Corrected Rationale: Valsartan is an angiotensin II receptor blocker (ARB) that can cause hyperkalemia by affecting the renin-angiotensin-aldosterone system. The nurse should closely monitor the client's potassium levels due to the risk of hyperkalemia, which can lead to serious cardiac complications. Choice B, hypoglycemia, is not a common adverse effect of Valsartan. Choice C, bradycardia, is not directly associated with Valsartan use. Choice D, hypercalcemia, is not a typical adverse effect of Valsartan.