Correct Answer: B

Rationale: The correct answer is B. A PaCO2 level of 55 mm Hg is elevated, indicating carbon dioxide retention, a common complication of emphysema that necessitates intervention. Elevated PaCO2 can lead to respiratory acidosis, reflecting inadequate ventilation. Choices A, C, and D are within normal ranges. A PaO2 level of 89 mm Hg is acceptable. An HCO3 level of 25 mEq/L falls within the normal range, suggesting adequate compensation. A pH level of 7.37 is also within the normal range, indicating the client's acid-base balance is maintained.

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: 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: D

Rationale: In chronic renal failure, it is essential to restrict protein intake to the Recommended Dietary Allowance (RDA) to reduce the accumulation of waste products that the kidneys can no longer effectively eliminate. Choices A, B, and C are incorrect because in chronic renal failure, high calcium, high potassium, and increased fluid intake can further strain the kidneys and worsen the condition.

Correct Answer: D

Rationale: Chlorine bleach is the most appropriate agent for disinfecting surfaces contaminated with blood. It is effective in killing a wide range of pathogens, including viruses. Hydrogen peroxide (Choice A) is not as effective as chlorine bleach for bloodborne pathogen disinfection. Chlorhexidine (Choice B) and isopropyl alcohol (Choice C) are more commonly used for skin antisepsis rather than surface disinfection, making them less suitable options in this scenario.