Correct Answer: D

Rationale: In a child with hypothyroidism, weight gain is a typical finding due to the slowed metabolism associated with the condition. This occurs because thyroid hormone levels are insufficient to regulate metabolism effectively. Choices A, B, and C are not typically associated with hypothyroidism. Nervousness is more commonly seen in conditions like hyperthyroidism, where there is an excess of thyroid hormones. Heat intolerance may be seen in hyperthyroidism as well, where the body's metabolism is increased. Smooth velvety skin is a characteristic finding in conditions like Cushing's syndrome, where there is excess cortisol production.

Correct Answer: A

Rationale: Checking blood glucose levels before meals and at bedtime is essential in managing type 1 diabetes mellitus as it helps in monitoring blood sugar levels at different times of the day and adjusting insulin doses accordingly. Option B about using a lancet device to obtain blood samples is a technique rather than an emphasis on monitoring frequency. Option C suggesting the use of urine test strips is incorrect as urine test strips are not recommended for accurate real-time monitoring of blood glucose levels in type 1 diabetes. Option D, recognizing signs of hypoglycemia, is important but not the primary emphasis when educating about blood glucose monitoring.

Correct Answer: A

Rationale: Infection is the greatest risk for an infant with exstrophy of the bladder due to the exposure of the bladder and surrounding tissues. The exposed bladder increases the risk of infection as it lacks the protective covering of the skin. Dehydration (Choice B) may occur but is not the greatest risk compared to infection. Urinary retention (Choice C) is less likely due to the nature of the condition. Intestinal obstruction (Choice D) is not directly associated with exstrophy of the bladder.

Correct Answer: A

Rationale: The priority nursing action when a child with a suspected fracture is brought to the emergency department is to immobilize the affected limb. Immobilization helps prevent further injury until a fracture is confirmed or ruled out. Applying ice or elevating the limb can wait until after immobilization has been achieved. Checking the child's neurovascular status is important but is not the priority action in this situation.

Correct Answer: B

Rationale: The correct answer is B: Tissue oxygen needs. Polycythemia occurs in response to chronic hypoxia, leading the body to increase red blood cell production to enhance oxygen delivery. In tetralogy of Fallot, a congenital heart defect that results in reduced oxygen levels in the blood, the body compensates by producing more red blood cells. Choice A is incorrect as low tissue oxygen needs would not trigger polycythemia. Choice C, diminished iron levels, is not the cause of polycythemia in this case. Choice D, hypertrophic cardiac muscle, is unrelated to the pathophysiology of polycythemia in tetralogy of Fallot.