Correct Answer: A

Rationale: Carrots and green, leafy vegetables are high in potassium, which should be avoided in hyperkalemia. Therefore, this choice requires further instruction by the nurse to prevent exacerbating the child's condition.

Correct Answer: B

Rationale: Repositioning every 2 hours is crucial in preventing skin breakdown in an edematous child on bed rest. This intervention helps redistribute pressure and maintain skin integrity, reducing the risk of pressure ulcers. It is an essential part of care for patients with limited mobility to ensure their comfort and prevent complications related to immobility.

Correct Answer: B

Rationale: Children with brain tumors commonly experience frequent headaches due to increased intracranial pressure. This pressure can result in pain and discomfort, leading to headaches as a common symptom. Other symptoms may include nausea, vomiting, changes in vision, and behavioral changes, but headaches are a prominent feature in children with brain tumors.

Correct Answer: C

Rationale: The correct answer is C: 'Dry, hacking cough.' A dry, hacking cough is a classic manifestation of pertussis. Pertussis typically presents with symptoms of an upper respiratory tract infection, starting with a persistent, severe, and uncontrollable cough that can worsen at night. This cough is often followed by a high-pitched 'whoop' sound as the patient tries to catch their breath, hence the term 'whooping cough.' In contrast, options A, B, and D are not typically associated with pertussis. Inflamed throat with exudate may suggest a bacterial throat infection like streptococcal pharyngitis, purulent eye drainage is more indicative of a bacterial conjunctivitis, and Koplik spots on the buccal mucosa are specific to measles. Therefore, recognizing the dry, hacking cough as a manifestation of pertussis is crucial for early identification and appropriate management of the disease.

Correct Answer: A

Rationale: Carrots and green, leafy vegetables are high in potassium, which should be avoided in hyperkalemia. Therefore, this choice requires further instruction by the nurse to prevent exacerbating the child's condition.