Correct Answer: A

Rationale: When assessing a 2-year-old child with abdominal pain and adequate perfusion, it is important to examine the child in the parent's arms. This approach helps reduce the child's anxiety, provides comfort, and can facilitate a more accurate assessment. Palpating the painful area of the abdomen first (choice B) may cause discomfort and increase anxiety in the child. Placing the child supine and palpating the abdomen (choice C) without considering the child's comfort and security may lead to resistance and inaccurate assessment. Separating the child from the parent to ensure a reliable examination (choice D) can further increase anxiety and hinder the assessment process. Therefore, examining the child in the parent's arms (choice A) is the most appropriate and effective approach in this scenario.

Correct Answer: D

Rationale: The correct answer is D: "This is a lifelong problem, and it is recommended that dietary restrictions must be continued." PKU requires a lifelong adherence to a specific diet low in phenylalanine to prevent cognitive and developmental issues. Phenylalanine buildup can lead to irreversible damage, making it crucial for individuals with PKU to maintain dietary restrictions throughout their lives. Choices A, B, and C are incorrect because they do not address the lifelong nature of dietary restrictions necessary for PKU management.

Correct Answer: A

Rationale: In Friedman's structural functional theory, the affective function of a family involves meeting the love and belonging needs of each member. This includes emotional support, care, and connections that contribute to the overall well-being of the family unit. Choice B is incorrect as it pertains more to the socialization function of the family, where children learn societal roles. Choice C relates to the economic function of the family, ensuring resources are available and allocated appropriately. Choice D focuses on the instrumental function of the family, which involves meeting the physical needs and health of its members.

Correct Answer: B

Rationale: In a child with a disorder of the posterior pituitary gland, desmopressin acetate is commonly used to manage the condition by replacing the antidiuretic hormone. Instructing the parents to administer desmopressin acetate correctly is essential for the child's treatment. The other options are incorrect because growth hormone treatment, stopping treatment at puberty, and reporting signs of acute adrenal crisis are not directly related to managing a disorder of the posterior pituitary gland.

Correct Answer: D

Rationale: The varicella vaccine is specifically designed to prevent chickenpox. Measles, mumps, and rubella are prevented by different vaccines: Measles is prevented by the measles, mumps, and rubella (MMR) vaccine; Mumps is prevented by the MMR vaccine; and Rubella is also prevented by the MMR vaccine. Therefore, the correct answer is D, Chickenpox, as it is the disease prevented by the varicella vaccine.