Correct Answer: A

Rationale: The correct answer is A: 'Pupils react to light.' Newborns' pupils do react to light, indicating that the visual pathway is functioning. However, a neonate's vision is still developing, and they can only focus on objects close to their face. Choice B is incorrect because tear glands are functional at birth. Choice C is incorrect because the blink reflex is present in neonates and helps protect their eyes. Choice D is incorrect as neonates' ciliary muscles are not fully developed.

Correct Answer: A

Rationale: The Advisory Committee on Immunization Practices (ACIP) of the Centers for Disease Control and Prevention (CDC) and American College of Obstetricians and Gynecologists recommend that pregnant adolescents and women without protection against pertussis should receive the Tdap vaccine ideally between 27 and 36 weeks of gestation or postpartum before discharge from the hospital. This timeframe allows for the development of antibodies in the mother to protect her and provide passive immunity to the infant. Administering the vaccine during the first trimester (Choice D) is not recommended as the optimal time is between 27 and 36 weeks. Choice B, during the first prenatal visit, is too early for optimal protection, and Choice C, 24 hours prior to delivery, does not provide enough time for the vaccine to be effective before birth.

Correct Answer: A

Rationale: The correct answer is A. A child with chickenpox should not go to the playroom due to being contagious, as the virus can easily spread to other children. Children with fractures (choice B), new-onset diabetes mellitus (choice C), or postoperative appendectomy (choice D) do not pose a risk of spreading an infectious disease, so they can safely go to the playroom.

Correct Answer: A

Rationale: A pacifier with an easily grasped handle is safer and more convenient for the infant to use without the risk of choking hazards that detachable parts might pose.

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.