Correct Answer: D

Rationale: The correct answer is D. Infants have a higher extracellular fluid requirement per unit of body weight, making them more susceptible to dehydration and electrolyte imbalances during illnesses such as diarrhea. Choice A is incorrect because cellular metabolism being unstable is not the primary explanation for the symptoms described. Choice B is incorrect as the proportion of water in the body alone does not fully explain the increased risk of dehydration in infants. Choice C is incorrect because while renal function is immature in children, it is not the most relevant factor in this scenario compared to the increased fluid requirements.

Correct Answer: B

Rationale: The correct answer is B. Urticaria is a type I hypersensitivity reaction where histamine release leads to vasodilation and the formation of characteristic wheals. Choice A is incorrect as urticaria is associated with type I hypersensitivity, not type IV. Choice C is incorrect because in urticaria, erythema typically appears before the development of wheals. Choice D is incorrect as urticaria is typically pruritic and does not blanch with pressure.

Correct Answer: A

Rationale: The correct answer is to rotate injection sites. Rotating injection sites is crucial in insulin administration to prevent lipodystrophy, which is the breakdown of subcutaneous fat at the injection site. It also helps ensure consistent insulin absorption. Administering insulin before meals (choice B) is important to match insulin peak action with the rise in blood glucose after eating. Storing insulin in the refrigerator (choice C) is correct to maintain its potency and stability. Administering insulin at bedtime (choice D) may not be suitable for all patients and is not a universal recommendation for insulin administration.

Correct Answer: C

Rationale: Monitoring urine output is crucial in assessing kidney function in a child with acute glomerulonephritis. In this condition, there is inflammation in the glomeruli of the kidneys, affecting their ability to filter waste and excess fluids from the blood. Monitoring urine output helps evaluate the kidneys' ability to excrete waste and maintain fluid balance. Options A, B, and D are less relevant in the context of acute glomerulonephritis. Monitoring blood glucose levels is more pertinent in conditions like diabetes, monitoring respiratory rate is important for respiratory conditions, and monitoring for signs of infection is crucial in cases of suspected infections but is not the primary assessment focus in acute glomerulonephritis.

Correct Answer: A

Rationale: When a pregnant woman experiences a seizure, it is crucial to transport her on her left side. This position helps to improve blood flow to the fetus by preventing compression of the inferior vena cava, reducing the risk of further complications. Placing her in the prone position (lying face down) or supine position (lying on her back) may compromise blood flow to the fetus and lead to adverse outcomes. Similarly, transporting her in a semi-sitting position may not provide the optimal circulation needed for both the woman and the fetus during this critical situation.