Correct Answer: D

Rationale: The FLACC Behavioral Pain Assessment Scale is the most suitable tool for assessing pain in 2-year-old children postoperatively. It assesses pain by evaluating facial expression, leg movement, activity, cry, and consolability, making it effective for non-verbal children. The Poker chip tool is not appropriate for this age group. The Oucher Scale and Faces Pain Rating Scale are more suitable for older children who can self-report pain levels.

Correct Answer: B

Rationale: The correct site to administer an intramuscular (IM) vaccine to a newborn is the vastus lateralis muscle. For newborns, the vastus lateralis is preferred over the dorsogluteal site because the dorsogluteal site has been associated with low antibody seroconversion rates, indicating a reduced immune response. The vastus lateralis is also recommended for IM injections in newborns, while the deltoid muscle is preferred for older infants and children. The ventral gluteal muscle and the biceps muscle are not appropriate sites for IM injections. Therefore, choice B is the correct answer.

Correct Answer: A

Rationale: Preschoolers may engage in magical thinking and believe inanimate objects are alive, so the nurse should explain the equipment in a way that reduces fear.

Correct Answer: D

Rationale: Upper arm circumference correlates best with total muscle mass because it includes both muscle and fat components, making it a reliable indicator of muscle mass.

Correct Answer: C

Rationale: The correct answer is C: "I will administer this medication with meals and snacks." Pancreatic enzymes should be administered with meals and snacks to aid in the digestion of nutrients in children with cystic fibrosis. Choices A, B, and D are incorrect because administering the medication without meals and snacks may not provide the necessary support for digestion needed in cystic fibrosis.