Correct Answer: D

Rationale: The most indicative behavior of ADHD is the inability to sit still and constant movement, known as hyperactivity. This behavior is a hallmark symptom of ADHD, making option D the correct choice. Options A, B, and C do not specifically reflect the characteristic hyperactivity associated with ADHD, making them less indicative of the disorder. While option B suggests impulsivity, it is not as specific to ADHD as the hyperactivity described in option D.

Correct Answer: C

Rationale: PCA pumps are designed to deliver both a continuous baseline dose and patient-activated bolus doses, which can help manage pain effectively while minimizing the risk of overdose.

Correct Answer: A

Rationale: The correct answer is A: Transition from fetal to neonatal breathing. The most critical physiological change required of newborns at birth is the initiation of breathing. This transition is crucial for the newborn to start exchanging oxygen and carbon dioxide outside the womb, marking the beginning of their independent respiratory function. Choices B, C, and D are important aspects of newborn care but are not as immediately critical as the establishment of breathing for oxygenation and removal of carbon dioxide, which is essential for the newborn's survival and adaptation to extrauterine life.

Correct Answer: B

Rationale: Socializing, using clich©s, and defending a situation are all barriers to effective therapeutic communication. Silence is a useful tool in therapeutic communication.

Correct Answer: B

Rationale: The dorsogluteal muscle is contraindicated for immunizations in infants and young children due to the risk of injury to the sciatic nerve. The anterolateral thigh is the preferred site.