Correct Answer: C

Rationale: The correct answer is C: Decreased serum osmolality. Syndrome of inappropriate antidiuretic hormone (SIADH) is characterized by the excessive release of antidiuretic hormone (ADH), leading to water retention and dilutional hyponatremia. The dilution of sodium results in decreased serum osmolality. Option A is incorrect because SIADH causes hyponatremia, resulting in decreased serum sodium levels. Option B is incorrect because SIADH leads to concentrated urine with increased urine specific gravity. Option D is incorrect as SIADH does not typically affect serum potassium levels.

Correct Answer: C

Rationale: Levothyroxine should be taken on an empty stomach in the morning to enhance absorption and efficacy. Taking it with meals (Choice A) may interfere with absorption due to food interactions. Taking it before bedtime (Choice B) can lead to difficulties with absorption and may disrupt the sleep cycle. Consuming levothyroxine with a glass of milk (Choice D) is not recommended as calcium in milk can interfere with its absorption. Therefore, the best practice is to take levothyroxine on an empty stomach in the morning to ensure optimal effectiveness.

Correct Answer: C

Rationale: In Cushing's syndrome, the characteristic features include central obesity with deposits of adipose tissue in the trunk and dorsocervical area, often referred to as a 'buffalo hump.' Hypotension (Choice A) is not typically associated with Cushing's syndrome; instead, hypertension is more common. Thick, coarse skin (Choice B) is seen in conditions like hypothyroidism, not specifically in Cushing's syndrome. Weight gain in the arms and legs (Choice D) is not a typical finding in Cushing's syndrome; rather, weight gain is more prominent in the central areas of the body.

Correct Answer: D

Rationale: The correct answer is to advise the client to avoid using sharp instruments to trim the toenails. This is crucial because using sharp instruments can lead to injuries such as cuts or wounds, increasing the risk of infections, especially in clients with diabetes who have decreased sensation in their feet. Choice A is incorrect because tight shoes can restrict circulation and increase the risk of pressure sores. Choice B is incorrect because applying lotion between the toes can create a moist environment, leading to fungal infections. Choice C is incorrect because using a heating pad can lead to burns, which can go unnoticed due to decreased sensation in diabetic feet.

Correct Answer: A

Rationale: In hyperparathyroidism, there are already elevated calcium levels in the body. Therefore, clients should avoid high-calcium foods like milk to prevent further increase in calcium levels. Bananas, spinach, and processed meats do not have significant calcium content and do not need to be avoided specifically in hyperparathyroidism.