Correct Answer: D

Rationale: Reduced serum albumin is a hallmark of minimal change nephrotic syndrome (MCNS) due to massive proteinuria. This results in hypoalbuminemia, which contributes to the edema characteristic of this condition.

Correct Answer: B

Rationale: Postinfectious glomerulonephritis is typically caused by immune complex deposition in the glomeruli following a streptococcal infection. This immune response leads to inflammation and impaired kidney function.

Correct Answer: D

Rationale: Infrequent voiding can lead to urinary stasis, which increases the risk of urinary tract infections by allowing bacteria to multiply in the bladder. Encouraging regular voiding and proper hydration can help prevent UTIs. Choices A, B, and C are incorrect. Excessive intake of carbonated beverages may irritate the bladder but is not a direct cause of UTIs. Insufficient water intake can concentrate urine but does not necessarily lead to infections. A voiding pattern of 5-6 times a day is within the normal range and is not associated with increased UTI risk.

Correct Answer: A

Rationale: Renal ultrasonography provides imaging of the renal parenchyma and pelvis without the risks associated with radiation or radioactive isotopes, making it a safer option, especially for children.

Correct Answer: A

Rationale: It is important for the nurse to provide the parents with accurate information so they can confidently explain the situation to others, helping to reduce stress and misinformation. Avoiding family and friends or minimizing the problem is not helpful.