Correct Answer: B

Rationale: The correct answer is B: Steroids. Children receiving steroids should not receive the varicella vaccine as it can increase the risk of severe infection due to the immunosuppressive effects of steroids. Insulin (Choice A), antibiotics (Choice C), and anticonvulsants (Choice D) do not interact with the varicella vaccine in the same way as steroids, and therefore, they are not contraindicated.

Correct Answer: B

Rationale: The most important factor in preparing a toddler for additional surgery is their previous experience of hospitalization. This familiarity can help reduce anxiety and fear associated with the hospital environment and medical procedures. Choice A, satisfying the child's wishes, may not always be feasible or in the child's best interest during medical procedures. Choice C, preventing the child from being with strangers, may not address the core issue of preparing the child for surgery. Choice D, ensuring the child still receives parental affection, is important but may not directly address the preparation needed for surgery.

Correct Answer: B

Rationale: Covering the sac with saline-soaked nonadhesive gauze is essential in the preoperative care of an infant with myelomeningocele. This practice helps prevent infection and maintains moisture around the sac before surgery, promoting optimal healing outcomes. Positioning the infant supine with a pillow under the buttocks may be uncomfortable and unnecessary. Wrapping the infant snugly in a blanket does not address the specific care needs of the myelomeningocele. Applying a diaper over the sac can increase the risk of infection and should be avoided in this case.

Correct Answer: B

Rationale: The correct answer is B: Diarrhea. Rotavirus infection commonly presents with symptoms such as watery diarrhea, fever, vomiting, and abdominal pain. However, diarrhea is the hallmark symptom of rotavirus infection, often leading to dehydration in children. Abdominal pain (choice A) can also be present but is not as specific to rotavirus infection as diarrhea. Constipation (choice C) is not a typical symptom of rotavirus infection. While vomiting (choice D) can occur in rotavirus infection, it is more commonly associated with other gastrointestinal conditions.

Correct Answer: D

Rationale: The correct answer is D: "These responses are replaced by voluntary activity at about five months of age." The grasp reflex and startle reflex (Moro reflex) are normal in newborns but typically disappear as the infant's nervous system matures and voluntary control develops. Choice A is incorrect because checking the responses before deciding a course of action does not address the developmental milestone related to the reflexes. Choice B is incorrect as it jumps to a conclusion of developmental delay without considering the normal developmental process. Choice C is incorrect as additional sensory stimulation is not necessary for the return of these reflexes, as they are expected to naturally diminish as part of normal development.