Correct Answer: A

Rationale: The most crucial point to reinforce to the patient after a vasectomy is the need for continued contraception until it is confirmed that the ejaculate is sperm-free. Choice A emphasizes this by highlighting the importance of using another form of contraception until the healthcare provider confirms the absence of sperm. This is essential to prevent unintended pregnancies. Choices B, C, and D do not address the key point of ensuring contraception until sperm absence is confirmed and are therefore not as important to reinforce in this scenario.

Correct Answer: C

Rationale: The correct answer is C. Discarding leftovers after 48 hours is not an effective recommendation to prevent foodborne illnesses. Leftovers should actually be discarded within 2 hours if they have been at room temperature. Choices A, B, and D are all effective strategies to prevent foodborne illnesses: avoiding unpasteurized dairy products reduces the risk of harmful bacteria, keeping cold food temperatures below 4.4°C (40°F) inhibits bacterial growth, and washing raw vegetables thoroughly removes contaminants.

Correct Answer: A

Rationale: The correct answer is to change the TPN tubing and solution every 24 hours to reduce the risk of infection. This practice helps prevent microbial growth and contamination in the TPN solution. Monitoring the infusion rate closely (choice B) is important for preventing metabolic complications but does not directly reduce the risk of infection. Keeping the head of the bed elevated (choice C) is beneficial for preventing aspiration in feeding tube placement but is unrelated to reducing infection risk in TPN. Ensuring the solution is at room temperature before infusing (choice D) is essential for patient comfort and preventing metabolic complications but does not specifically address infection risk reduction.

Correct Answer: C

Rationale: The correct answer is C: 2 tbsp of peanut butter. Two tablespoons of peanut butter is approximately equivalent to 4 teaspoons of oil, providing healthy fats in the diet. Choice A, 1 tbsp of soft margarine, is not equivalent to 4 tsp of oil as margarine contains additional ingredients. Choice B, ½ oz of nuts, and choice D, 1 oz of sunflower seeds, do not provide an equivalent amount of oil as requested in the question.

Correct Answer: B

Rationale: Postoperative arrhythmias are a common and potentially serious complication after cardiac surgery, making them a priority to monitor. Assessing for postoperative arrhythmias takes precedence over other assessments like checking nail beds for color and refill, auscultating for pulmonary congestion, or monitoring peripheral pulses as arrhythmias can have immediate and severe implications for the child's health.