Correct Answer: B

Rationale: Assessing the child's dietary intake is crucial for managing asthma symptoms as certain foods can trigger or worsen asthma attacks. Monitoring dietary intake helps ensure the child receives proper nutrition and avoids triggers. Assessing sleep patterns (Choice A) may be relevant but not as directly impactful on asthma management. Academic performance (Choice C) and behavior at home (Choice D) are important aspects of a child's overall health but are not as directly related to asthma management as dietary intake.

Correct Answer: D

Rationale: A low-phenylalanine diet is necessary for infants with PKU because it helps prevent the accumulation of phenylalanine, which can result in brain damage. Fat-free (Choice A) and protein-enriched (Choice B) diets are not specifically indicated for PKU. While phenylalanine-free (Choice C) may seem logical, complete elimination of phenylalanine is not practical or safe as it is an essential amino acid. Therefore, the correct choice is a low-phenylalanine diet, which restricts phenylalanine intake to a safe level.

Correct Answer: B

Rationale: The correct dietary instruction for a child with GERD is to avoid gluten. Gluten is a protein found in wheat, barley, and rye, and it can exacerbate GERD symptoms in some individuals. Avoiding gluten can help reduce inflammation and irritation in the gastrointestinal tract, thereby alleviating symptoms of GERD. Choices A, C, and D are incorrect because while spicy foods, high-fat foods, and dairy products can trigger GERD symptoms in some individuals, avoiding gluten specifically is more relevant for managing GERD.

Correct Answer: D

Rationale: The correct answer is D. Novolin N insulin peaks in the evening, which can lead to hypoglycemia during the night. Providing an evening snack helps to counteract the late insulin activity and prevent hypoglycemia. Choice A is incorrect because the primary reason for the evening snack is not to encourage adherence to the diet. Choice B is incorrect as the snack is not primarily for immediate energy use. Choice C is incorrect as the goal of the snack is not to help the child gain weight but to manage blood sugar levels.

Correct Answer: A

Rationale: Trisomy 21, also known as Down syndrome, is caused by nondisjunction, which is an error in cell division that leads to the presence of an extra chromosome 21. This additional chromosome alters the normal genetic makeup, resulting in the characteristics associated with Down syndrome. Therefore, the correct answer is nondisjunction (Choice A). Choices B, C, and D are incorrect because Trisomy 21 is not caused by X-linked recessive inheritance, genomic imprinting, or autosomal dominant inheritance. Understanding the specific genetic mechanism involved in Trisomy 21 is crucial for grasping the basis of this chromosomal disorder.