Correct Answer: A

Rationale: Playing peek-a-boo is an ideal play activity for a 7-month-old as it encourages visual tracking and social interaction, which are key developmental milestones at this age.

Correct Answer: C

Rationale: By 5 months, an infant's weight should typically double from birth, and length should increase by approximately 50%.

Correct Answer: D

Rationale: A compromised immune system is a contraindication for the MMRV vaccine because it is a live attenuated vaccine and could potentially cause an infection in an immunocompromised child.

Correct Answer: B

Rationale: The correct answer is B. School-age children are typically able to play structured games with other children and follow the rules of the game. This ability reflects their growing cognitive and social development. Choice A is incorrect as school-age children often engage in group play. Choice C is incorrect as school-age children usually have more autonomy in their play choices. Choice D is incorrect as school-age children tend to form more organized play settings rather than loose groups.

Correct Answer: C

Rationale: Constipation is one of the most common side effects of opioid administration due to the slowing down of gastrointestinal motility. Opioids affect the bowel movements, leading to constipation. Euphoria, while a possible effect, is less common than constipation. Diuresis is not a typical side effect of opioids; instead, urinary retention may occur. Allergic reactions are rare side effects of opioids, with symptoms such as rash, itching, or anaphylaxis.