Correct Answer: D

Rationale: The correct answer is D: Pulling to a stand. By 10 months of age, most infants should be able to pull themselves up to a standing position while holding onto furniture or other support. This milestone indicates good strength and coordination in the lower body. Choice A, Crawling, is typically achieved around 6-9 months of age. Choice B, Sitting without support, usually occurs around 6-8 months. Choice C, Standing with assistance, can typically be seen around 9-12 months, but pulling to a stand is a more advanced milestone expected by 10 months.

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: During a vaso-occlusive crisis in sickle cell anemia, ensuring adequate hydration is crucial because it helps to reduce the viscosity of the blood and prevent further sickling of the cells. Administering oxygen may be necessary in some cases to improve tissue oxygenation, but hydration is the priority to prevent complications. Monitoring vital signs is important, but hydration takes precedence during a vaso-occlusive crisis. Administering pain medication is important for pain management but does not address the underlying issue of vaso-occlusion.

Correct Answer: B

Rationale: Metatarsus adductus is a condition where the front part of the foot is turned inward. It is often caused by the baby's position in the womb, leading to pressure on the foot during fetal development. Choice A is incorrect as metatarsus adductus is not primarily caused by a genetic defect in the bones. Choice C is incorrect as the cause of metatarsus adductus is known to be related to intrauterine positioning. Choice D is incorrect as metatarsus adductus specifically pertains to the foot and not the hip.

Correct Answer: A

Rationale: Administering a bronchodilator is the priority intervention for a child experiencing an acute asthma exacerbation. Bronchodilators help to dilate the airways quickly, providing immediate relief by opening up the narrowed air passages in asthma. Antihistamines are not the first-line treatment for asthma exacerbations and may not address the underlying bronchoconstriction. Corticosteroids are important for long-term control of asthma but may take longer to have an effect compared to bronchodilators. Administering oxygen is essential for hypoxemia in asthma exacerbations, but the priority is to relieve bronchoconstriction promptly with a bronchodilator.