Correct Answer: B

Rationale: Rectal bleeding is more commonly associated with ulcerative colitis (UC) than with Crohn disease (CD). While both conditions can cause abdominal pain and growth issues, bleeding is a hallmark of UC due to its superficial mucosal inflammation. Perianal lesions are more characteristic of CD, and growth retardation is typically not a direct clinical manifestation of either CD or UC.

Correct Answer: D

Rationale: Postoperative care should focus on monitoring changes in stooling patterns, which could indicate complications such as stenosis or obstruction. It is crucial to educate the family on the importance of promptly reporting any changes in stooling patterns to the healthcare provider. Options A and B are not recommended unless specifically ordered by the physician as they can potentially cause harm or discomfort postoperatively. Option C may not be appropriate immediately after surgery and should be guided by the healthcare provider's recommendations.

Correct Answer: C

Rationale: The correct answer is C: Influenza. The influenza vaccine is produced using egg-based technology, so individuals with a severe egg allergy are at risk of an allergic reaction if vaccinated with the influenza vaccine. This is due to the potential presence of egg proteins in the vaccine. Choices A, B, and D are not contraindicated in children with severe egg allergy. The MMR and Varicella vaccines do not pose a risk for children with egg allergies, and the Hepatitis B vaccine is also safe for these individuals.

Correct Answer: A

Rationale: The correct answer is A: Careful bathing and handling. Preoperative care for a child with a Wilms tumor should focus on preventing any trauma to the abdomen, which could lead to tumor rupture. Monitoring behavioral status and maintaining strict isolation are not as critical in this situation. Behavioral status is important but not a priority in preoperative care for a Wilms tumor. Strict isolation is not necessary unless there are specific infectious concerns, which is not typically the case for a Wilms tumor. Administration of packed red blood cells is not a standard preoperative intervention for Wilms tumor.

Correct Answer: A

Rationale: The correct answer is A: Tetralogy of Fallot. Tetralogy of Fallot is often associated with a 'boot-shaped' heart appearance on a chest x-ray due to the characteristic heart anatomy in this condition. This appearance is caused by the combination of pulmonary stenosis, overriding aorta, ventricular septal defect, and right ventricular hypertrophy. Choice B, Transposition of the great arteries, is incorrect because it presents with a 'egg-on-a-string' appearance on x-ray due to the abnormal position of the aorta and pulmonary artery. Choice C, Coarctation of the aorta, typically presents with rib notching on x-ray. Choice D, Ventricular septal defect, does not produce the 'boot-shaped' heart appearance seen in Tetralogy of Fallot.