Correct Answer: C

Rationale: In pyloric stenosis, a palpable olive-like mass in the abdomen is a classic finding. This mass is due to the hypertrophied pyloric muscle. Abdominal rigidity (choice A) is associated with conditions like peritonitis, substernal retraction (choice B) is typically seen in respiratory distress, and marked distention of the lower abdomen (choice D) is more characteristic of conditions like intestinal obstruction rather than pyloric stenosis.

Correct Answer: B

Rationale: Edema is a hallmark clinical manifestation of nephrotic syndrome. In nephrotic syndrome, there is increased glomerular permeability leading to the loss of proteins, particularly albumin, in the urine. This results in decreased oncotic pressure, leading to fluid shifting into the interstitial spaces and causing edema. Jaundice (Choice A) is not a typical clinical manifestation of nephrotic syndrome. Hypertension (Choice C) is more commonly associated with conditions like glomerulonephritis. Polyuria (Choice D) is not a primary symptom of nephrotic syndrome; instead, patients may have reduced urine output due to fluid retention from edema.

Correct Answer: A

Rationale: The American Academy of Pediatrics recommends the intramuscular polio vaccine over the oral vaccine due to its superior safety profile. Intramuscular administration ensures better immunogenicity and protection against poliovirus. Choice B is incorrect as the intramuscular vaccine is preferred for safety reasons. Choice C is incorrect because the recommendation is based on safety, not cost. Choice D is incorrect as the CDC recommendation is not solely based on immunocompromised status but rather on the overall safety and efficacy of the vaccine.

Correct Answer: B

Rationale: The correct dietary instruction for a child with GERD is to avoid gluten. Gluten is a protein found in wheat, barley, and rye, and it can exacerbate GERD symptoms in some individuals. Avoiding gluten can help reduce inflammation and irritation in the gastrointestinal tract, thereby alleviating symptoms of GERD. Choices A, C, and D are incorrect because while spicy foods, high-fat foods, and dairy products can trigger GERD symptoms in some individuals, avoiding gluten specifically is more relevant for managing GERD.

Correct Answer: D

Rationale: It is recommended to perform palate closure surgery before the child starts using faulty speech patterns to prevent the development of speech issues that may be harder to correct later. Delaying surgery until after the age of 2 can lead to the child forming incorrect speech habits, which can be challenging to correct. Choices A, B, and C are incorrect because they do not address the specific concern related to speech development in children with cleft palates.