Correct Answer: C

Rationale: Hirschsprung disease is characterized by chronic, progressive constipation and failure to gain weight. These symptoms are indicative of the disorder due to the absence of ganglion cells in the distal colon, leading to impaired motility and obstruction.

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: A

Rationale: Glucocorticoids are contraindicated in the treatment of a patient with systemic fungal infection or in patients receiving live vaccines due to their immunosuppressive effects. Glucocorticoids can exacerbate fungal infections by suppressing the immune response. While caution is advised in patients with diabetes mellitus, myasthenia gravis, and glaucoma, the presence of a systemic fungal infection warrants questioning the use of glucocorticoids to prevent worsening of the fungal infection.

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: D

Rationale: No vaccinations or immunizations should be administered while the disease is active and during immunosuppressive therapy.