Correct Answer: A

Rationale: The correct answer is A: Leukopenia. Propylthiouracil can lead to bone marrow suppression, resulting in leukopenia. Monitoring white blood cell counts is crucial to detect this potential side effect early. Choice B, hyperglycemia, is not typically associated with propylthiouracil use. Choice C, hypertension, is not a common side effect of propylthiouracil. Choice D, weight gain, is also not a typical side effect of propylthiouracil therapy.

Correct Answer: C

Rationale: Insulin injection sites should be rotated every 2-3 weeks to prevent lipodystrophy and ensure proper insulin absorption. Option A ('Every third day') is too frequent and does not allow enough time for the previous site to heal properly. Option B ('Every week') might not provide adequate time for the tissue to recover. Option D ('Every 2-4 weeks') could potentially lead to overuse of a single injection site, increasing the risk of lipodystrophy and inconsistent insulin absorption. Therefore, the recommended interval of every 2-3 weeks is optimal for insulin injection site rotation.

Correct Answer: B

Rationale: The correct answer is B: Hyponatremia. Syndrome of inappropriate antidiuretic hormone (SIADH) is characterized by the excessive release of antidiuretic hormone (ADH), leading to water retention in the body. This causes dilutional hyponatremia, where the sodium levels in the blood become abnormally low. Option A, Hypernatremia, is incorrect because SIADH does not cause elevated sodium levels. Option C, Hyperkalemia, is incorrect as SIADH does not directly affect potassium levels. Option D, Hypercalcemia, is also incorrect as SIADH does not impact calcium levels.

Correct Answer: B

Rationale: In Addison's disease, the adrenal glands do not produce enough cortisol. Hydrocortisone is a glucocorticoid medication that is used to replace deficient cortisol levels in patients with Addison's disease. It helps stabilize blood pressure and fluid balance. Insulin (Choice A) is used to manage diabetes, not Addison's disease. Levothyroxine (Choice C) is a thyroid hormone replacement used to treat hypothyroidism, not Addison's disease. Methimazole (Choice D) is used in the treatment of hyperthyroidism, not Addison's disease.

Correct Answer: D

Rationale: The correct instruction for the client with type 2 DM regarding foot care is to wear comfortable shoes that allow air circulation. This helps prevent foot injuries and infections, which are common complications in clients with diabetes. Choice A is incorrect as soaking feet in hot water can lead to burns and skin damage. Choice B is incorrect because walking barefoot increases the risk of injury and infection. Choice C is incorrect as using a heating pad can also potentially lead to burns and skin damage.