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: The correct answer is D because maintaining oxygen saturation of 90% is a specific, measurable short-term goal that ensures adequate oxygenation. Choice A is not a goal focused on the client's physiological status but rather on the equipment. Choice B is related to activities of daily living and does not address the respiratory distress issue. Choice C is subjective and may not reflect the actual physiological improvement in the client's condition.

Correct Answer: B

Rationale: The correct answer is B. A urine output of 20 mL/hour is a sign of magnesium toxicity because decreased urine output can lead to accumulation of magnesium. Choices A, C, and D are not indicators of magnesium toxicity. Elevated blood glucose, high systolic blood pressure, and normal BUN levels do not specifically point towards magnesium toxicity.

Correct Answer: D

Rationale: The correct answer is D: Administer flumazenil. Flumazenil is the reversal agent for midazolam, a benzodiazepine, and should be administered to counteract respiratory depression. Placing the client in a prone position (choice A) could further compromise their breathing. Implementing positive pressure ventilation (choice B) is not indicated as the first step when dealing with respiratory depression due to sedation. Performing nasopharyngeal suctioning (choice C) is not appropriate in this situation where the client is experiencing respiratory depression due to medication sedation.

Correct Answer: A

Rationale: The correct answer is A: Recent blood transfusion. A recent blood transfusion can interfere with the effectiveness of the MMR vaccine, making it a contraindication. Choice B, allergy to penicillin, is not a contraindication for the MMR vaccine. Choice C, minor acute illness, is not a contraindication unless the child has a moderate to severe illness. Choice D, low-grade fever, is not a contraindication as long as the child does not have a moderate to severe febrile illness.