Correct Answer: A

Rationale: The correct answer is A: Spinach. Spinach is rich in calcium, making it a suitable choice for individuals with lactose intolerance who need to avoid dairy products. Peanut butter, ground beef, and carrots are not significant sources of calcium compared to spinach, and therefore, not the best recommendation for increasing calcium intake in lactose-intolerant individuals.

Correct Answer: C

Rationale: A flat anterior fontanel indicates effective treatment for dehydration in infants. Dehydration often causes sunken fontanels, so when the anterior fontanel becomes flat, it suggests that rehydration has occurred. Sunken anterior fontanel (Choice A) is a sign of dehydration, not effective treatment. Tenting skin turgor (Choice B) is also a sign of dehydration, indicating poor skin turgor. Hyperpnea (Choice D) is increased depth and rate of breathing and is not directly related to the hydration status of the client.

Correct Answer: C

Rationale: The correct answer is C: Impaired liver function. Impaired liver function is a contraindication to the use of oral contraceptives because they are metabolized in the liver. Choices A, B, and D are incorrect. Thyroid disease, allergy to penicillin, and abnormal blood glucose levels are not contraindications to combined oral contraceptives.

Correct Answer: D

Rationale: The correct answer is to restrict protein intake for a client with chronic renal failure. In renal failure, the kidneys are unable to effectively filter waste products. Excessive protein intake can lead to the accumulation of waste products, increasing the workload on the kidneys. Therefore, restricting protein intake is essential to prevent further kidney damage. Choices A, B, and C are incorrect. Increasing calcium intake is not specifically indicated for chronic renal failure. Increasing potassium intake can be dangerous in renal failure as impaired kidneys may not be able to excrete excess potassium. Increasing protein intake is contraindicated in chronic renal failure as it can worsen kidney function and increase the accumulation of waste products.

Correct Answer: B

Rationale: The correct answer is B: Urine output of 20 mL/hour. Urine output below 30 mL/hour is a sign of magnesium toxicity due to the risk of accumulation in the body. Choices A, C, and D are not indicative of magnesium toxicity. Elevated blood glucose, systolic blood pressure, and normal respiratory rate are not specific signs of magnesium toxicity.