Correct Answer: D

Rationale: Adolescents may feel anger and depression due to the loss of independence and control over their lives, which is imposed by the need for regular dialysis treatments. This reaction is common as they struggle with the restrictions placed on their social and personal lives.

Correct Answer: C

Rationale: The primary purpose of an NG tube post-surgery for Hirschsprung disease is to prevent abdominal distention by decompressing the stomach and intestines. This helps prevent complications and promotes healing.

Correct Answer: C

Rationale: Severe dehydration is the most common cause of acute renal failure in children, as it leads to prerenal azotemia, which can progress to renal failure if not corrected. Other causes like pyelonephritis and tubular destruction are less common and usually secondary to other conditions.

Correct Answer: B

Rationale: Radiographic examination is essential to confirm the location of the battery, as it can cause significant damage, particularly if lodged in the esophagus. Immediate surgery may be required depending on its location and the potential for causing harm.

Correct Answer: A

Rationale: Calcium gluconate, sodium bicarbonate, and glucose with insulin are used as temporary measures to rapidly reduce serum potassium levels. They help shift potassium into cells and stabilize the heart but do not remove potassium from the body like dialysis does.