Correct Answer: B

Rationale: The correct answer is B: 'Ensure that the antibiotic is administered as prescribed.' It is crucial for the parents to follow the prescribed antibiotic regimen to prevent infections and promote proper healing following cardiac surgery. Option A is incorrect because the timing of antibiotic administration may vary depending on the specific medication and instructions. Option C is not necessary and could potentially affect the antibiotic's effectiveness. Option D is not relevant to the administration of the antibiotic and does not ensure proper usage.

Correct Answer: D

Rationale: Macaroni and cheese and Cheerios are appropriate choices for a 30-month-old toddler on a regular diet. These foods are easy to chew, digest, and are generally well-liked by toddlers. Option A, a hamburger with bun and grapes, may be difficult for a toddler to handle due to the size of the hamburger and grapes pose a choking hazard. Option B, chicken fingers and french fries, may be too greasy and processed for a toddler's developing digestive system. Option C, hot dog with bun and potato chips, is also not ideal as hot dogs can be a choking hazard and potato chips are high in salt and may not provide adequate nutrition.

Correct Answer: C

Rationale: Scheduling the visit at a time that is convenient for the family is crucial for ensuring the family's receptiveness and availability, making the visit more productive. Choosing a time when the mother is feeding the infant (choice B) may not necessarily align with the family's overall convenience and may disrupt the feeding routine. Similarly, scheduling the visit when the husband is out of the home (choice A) might not be optimal as it may exclude an important family member and potentially impact the support system. While spending time with the family (choice D) is important, the primary focus should be on accommodating the family's schedule to maximize the effectiveness of the visit.

Correct Answer: A

Rationale: The correct answer is A. Surfactant therapy is explained to parents as a treatment that enhances the lungs' ability to exchange oxygen and carbon dioxide. This is essential for premature infants with respiratory distress syndrome (RDS) as it helps improve their respiratory function. Choices B, C, and D are incorrect because surfactant therapy primarily focuses on addressing lung function and is not related to sedation, apnea reduction, or fighting respiratory tract infections.

Correct Answer: B

Rationale: For a 2-year-old child, the maximum recommended amount of fluid for an isotonic enema is between 155 to 250 mL. This range is considered safe to prevent overdistension and potential harm to the child's rectum. Choices A, C, and D exceed the safe range for a 2-year-old child and can lead to complications such as bowel perforation or electrolyte imbalances.