Correct Answer: B

Rationale: The peak age for the onset of acute poststreptococcal glomerulonephritis is typically between 5 and 7 years old. This age group is most affected due to the higher incidence of streptococcal infections in school-aged children, which can lead to this renal complication.

Correct Answer: C

Rationale: Elevating the scrotum with a rolled washcloth helps reduce edema by promoting fluid drainage. Ice packs are not recommended due to the risk of frostbite, and warm moist packs are not typically used for this purpose. An upright position does not specifically address the edema.

Correct Answer: D

Rationale: The correct answer is D. Replacing carpet with hard flooring helps to reduce allergens and asthma triggers in the child's environment. Choice A is incorrect as having a dog in the child's room can worsen asthma symptoms due to pet dander. Choice B is incorrect because keeping plants in the child's room can increase mold spores and allergens. Choice C is incorrect as using a fireplace can introduce smoke and other irritants into the air, worsening asthma symptoms.

Correct Answer: C

Rationale: Fluid restriction is often necessary to manage severe edema associated with MCNS. Increasing protein is not typically recommended due to the risk of exacerbating proteinuria, and calorie reduction is not generally needed.

Correct Answer: C

Rationale: Vulvar irritation may indicate an infection or other issues and should be further evaluated. In a pubescent girl, breasts of slightly different sizes and irregular periods are common variations of normal development. Supernumerary nipple, an extra nipple, is a benign condition that is not typically concerning during puberty.