Correct Answer: D

Rationale: The correct answer is D, regression. Regression occurs when a child reverts to an earlier behavior, such as having accidents after being successfully toilet trained. This regression often happens due to stress or changes in routine. Choices A, B, and C are incorrect because positive reinforcement involves encouraging desired behavior, desensitization is a process of reducing sensitivity to a stimulus, and phobia is an intense fear or aversion to a specific object or situation, none of which directly apply to the described situation of the child having accidents after being toilet trained.

Correct Answer: D

Rationale: Infrequent voiding can lead to urinary stasis, which increases the risk of urinary tract infections by allowing bacteria to multiply in the bladder. Encouraging regular voiding and proper hydration can help prevent UTIs. Choices A, B, and C are incorrect. Excessive intake of carbonated beverages may irritate the bladder but is not a direct cause of UTIs. Insufficient water intake can concentrate urine but does not necessarily lead to infections. A voiding pattern of 5-6 times a day is within the normal range and is not associated with increased UTI risk.

Correct Answer: A

Rationale: The correct answer is A: Petechiae, fever, fatigue. Children with leukemia commonly present with petechiae (due to low platelet count), fever (due to infection), and fatigue (due to anemia), which are classic manifestations of the disease. Option B is incorrect because headache, papilledema, and irritability are more indicative of increased intracranial pressure, not leukemia. Option C is incorrect as muscle wasting and weight loss are not typical initial manifestations of leukemia in children. Option D is incorrect as decreased intracranial pressure, psychosis, and confusion are not commonly associated with leukemia.

Correct Answer: B

Rationale: The correct answer is B. Children with type 1 diabetes require insulin replacement because their pancreas produces little or no insulin. Oral hypoglycemics used in type 2 diabetes work by improving the effectiveness of insulin the body already makes, which is not sufficient in type 1 diabetes. Choice A is incorrect because the issue is not about the pancreas being adult or child-specific but rather the type of diabetes. Choice C is incorrect because it misstates the mechanism of action of the medications. Choice D is incorrect because it provides inaccurate information about the potential for the child's pancreas to produce insulin in the future, which is unlikely in type 1 diabetes.

Correct Answer: A

Rationale: In infants, urinary tract disorders may present with poor feeding, hypothermia, and frequent urination. Pallor can be associated with other conditions but is less specific to urinary tract disorders.