Correct Answer: C

Rationale: Delayed physical growth is a common finding in most children with symptomatic cardiac malformations. This occurs due to inadequate oxygenation and nutrient supply to tissues as a result of the cardiac defect. Mental retardation (Choice A) is not typically associated with cardiac malformations unless there are complications affecting brain function. Inherited genetic factors (Choice B) may contribute to the development of cardiac malformations but are not a direct common finding in affected children. Clubbing of the fingertips (Choice D) is more commonly associated with chronic respiratory or cardiac conditions, not specifically cardiac malformations in children.

Correct Answer: B

Rationale: Vomiting and poor appetite can be symptoms of neuroblastoma, a malignancy that affects the adrenal glands and sympathetic nervous system. A maculopapular rash on the palms (Choice A) is not typically associated with neuroblastoma. Irritability and poor weight gain (Choice C) may be non-specific findings and do not specifically point towards neuroblastoma. Auscultation findings of wheezing with diminished lung sounds (Choice D) are more indicative of respiratory conditions rather than neuroblastoma.

Correct Answer: C

Rationale: Visible peristalsis and weight loss are classic clinical manifestations of pyloric stenosis. The obstruction at the pyloric sphincter causes visible peristalsis as the stomach tries to push food through the narrowed opening, leading to the appearance of waves across the abdomen. Weight loss occurs due to poor feeding and frequent vomiting associated with pyloric stenosis. Choices A, B, and D are incorrect. Abdominal rigidity and pain on palpation, rounded abdomen and hypoactive bowel sounds, as well as distention of the lower abdomen and constipation are not typically seen in pyloric stenosis.

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.