Correct Answer: C

Rationale: The correct answer is C: Tremors. Lithium toxicity can present with symptoms such as tremors, nausea, and blurred vision. Tremors are a common early sign of lithium toxicity and should be monitored closely. While nausea and vomiting can also occur with lithium toxicity, tremors are more specific to lithium toxicity. Increased urination is not typically associated with lithium toxicity, and blurred vision is less common compared to tremors in this context.

Correct Answer: C

Rationale: The correct answer is C: 'Lowered immune system function.' As individuals age, their immune system tends to weaken, making them more susceptible to infections. Choices A, B, and D are incorrect because improved circulation and increased immune function would typically reduce the risk of infections, while dehydration can impact overall health but is not directly related to immune system function in the context of infection risk.

Correct Answer: B

Rationale: The correct answer is to verify the client's blood glucose level first before administering insulin. This step is crucial to determine the appropriate dose of insulin based on the client's current blood glucose level. Checking the expiration date (Choice A) is important but not the first step in this scenario. Obtaining the client's weight (Choice C) is not directly related to the immediate administration of insulin. Assessing for signs of hypoglycemia (Choice D) should be done after administering insulin to monitor for potential side effects or adverse reactions.

Correct Answer: C

Rationale: The correct answer is to advise the client to avoid potassium supplements. Spironolactone is a potassium-sparing diuretic, meaning it helps the body retain potassium. Adding potassium supplements on top of this medication can lead to hyperkalemia, an elevated level of potassium in the blood, which can be dangerous. Choices A, B, and D are incorrect because increasing potassium-rich foods, limiting sodium intake, and increasing protein intake are not specifically related to the dietary considerations when taking spironolactone.

Correct Answer: A

Rationale: Increased thirst is a classic symptom of hyperglycemia due to the body trying to eliminate excess glucose through urine, leading to dehydration and increased thirst. Weight gain, decreased urination, and fatigue are not typical signs of hyperglycemia. Weight gain is more commonly associated with conditions like hypothyroidism or fluid retention. Decreased urination is not a typical symptom of hyperglycemia, as high blood sugar levels usually lead to increased urination. Fatigue can be a symptom of hyperglycemia, but it is not as specific or characteristic as increased thirst.