Correct Answer: C

Rationale: Water and sodium retention is a major complication in chronic renal failure, leading to hypertension and edema. Hypokalemia and metabolic alkalosis are less common, and while BUN levels rise, retention rather than excretion is problematic in chronic renal failure.

Correct Answer: D

Rationale: Minimal change nephrotic syndrome is characterized by massive proteinuria, hypoalbuminemia, and edema due to the loss of protein in the urine. Hematuria, bacteriuria, and weight loss are not typical features of this condition.

Correct Answer: C

Rationale: Renal transplantation is the preferred method of treatment for children with end-stage renal disease, as it offers the best chance for a normal lifestyle compared to long-term dialysis. Transplantation can be performed at any age, and kidneys can come from adult donors as well.

Correct Answer: C

Rationale: The correct answer is C: Failure to pass meconium and abdominal distension. Hirschsprung's disease is commonly diagnosed in newborns due to the failure to pass meconium within the first 24-48 hours after birth and abdominal distension, indicating a bowel obstruction. Choices A, B, and D are incorrect because they do not correspond to the typical symptoms of Hirschsprung's disease. Acute diarrhea and dehydration, current jelly-like stools and pain, and projectile vomiting with altered electrolytes are not characteristic of this condition.

Correct Answer: B

Rationale: When taking a child's blood pressure, the nurse should select a cuff with a bladder width that covers 40% of the arm circumference at the midpoint of the upper arm. This ensures accurate readings. Choosing a cuff that covers less or more than 40% can lead to incorrect blood pressure measurements. Therefore, options A, C, and D are incorrect.