Correct Answer: C

Rationale: Newborns have a large surface area relative to their body weight, making them more susceptible to heat loss and requiring careful thermoregulation. Choice A is incorrect because renal function is not directly related to thermoregulation. Choice B is incorrect because a flexed posture actually helps reduce heat loss by minimizing the surface area exposed to the environment. Choice D is incorrect because neonates have limited subcutaneous fat, which contributes to their susceptibility to heat loss.

Correct Answer: C

Rationale: A low-phosphorus diet is recommended for children with chronic renal failure to prevent hyperphosphatemia, which can lead to bone disease and other complications. Phosphorus is found in many processed foods and should be limited. Choices A, B, and D are incorrect because high sodium intake can lead to fluid retention and hypertension, while Vitamin D supplementation and vitamins C, E, K are not specifically indicated for dietary recommendations in chronic renal failure.

Correct Answer: B

Rationale: The Faces Pain Rating Scale is appropriate for assessing pain in children who can express their feelings visually. For a 5-year-old child who can communicate effectively, using a tool like the Faces Pain Rating Scale, which uses facial expressions to indicate pain levels, is more suitable than the CRIES Scale (used for neonates), the SUN Scale (used for infants), or the NIPS Scale (used for preterm and term newborns).

Correct Answer: A

Rationale: More deaths due to unintentional injuries occur in males, which may be due to higher risk-taking behaviors.

Correct Answer: D

Rationale: The correct answer is D. Vaso-occlusive crises in sickle cell anemia are characterized by painful swelling of the joints in the hands and feet (hand-foot syndrome) and tissue engorgement due to the obstruction of blood flow by sickled cells. Choices A, B, and C are incorrect because circulatory collapse, hypovolemia, cardiomegaly, systolic murmur, hepatomegaly, and intrahepatic cholestasis are not typically associated with an acute vaso-occlusive crisis in sickle cell anemia.