Correct Answer: A

Rationale: Projectile vomiting is a classic clinical manifestation of pyloric stenosis in infants. This occurs due to the narrowing of the pyloric sphincter, leading to the forceful expulsion of gastric contents in a projectile manner. Diarrhea (choice B) is not typically associated with pyloric stenosis. Constipation (choice C) is also not a common symptom of this condition. Abdominal distension (choice D) may occur in pyloric stenosis but is not as specific or characteristic as projectile vomiting in diagnosing this condition.

Correct Answer: D

Rationale: Macaroni and cheese and Cheerios are appropriate choices for a 30-month-old toddler on a regular diet as they provide a balance of carbohydrates and protein. Option A, hamburger with bun and grapes, may be difficult for a toddler to chew, and grapes pose a choking hazard. Option B, chicken fingers and french fries, are high in unhealthy fats and sodium. Option C, hot dog with bun and potato chips, are processed foods high in salt and unhealthy fats, not ideal for a toddler's diet.

Correct Answer: C

Rationale: The correct dietary instruction for a child with GERD is to avoid high-fat foods. High-fat foods can relax the lower esophageal sphincter, leading to increased reflux. While avoiding gluten may be necessary for individuals with gluten sensitivity or celiac disease, it is not a standard recommendation for GERD. Avoiding spicy foods and dairy products may help some individuals with GERD, but the most crucial dietary advice is to avoid high-fat foods.

Correct Answer: A

Rationale: Applying a warm compress to the affected ear is a recommended home remedy for earaches as it can help reduce pain and discomfort. The warmth can also help improve circulation and promote drainage if there is fluid buildup. Giving a cold drink (Choice B) is not typically beneficial for earaches and fever. Administering acetaminophen (Choice C) can help reduce fever and alleviate pain, but addressing the earache directly with a warm compress is a more targeted approach. Taking the child to the emergency department (Choice D) is not necessary for a common earache unless there are severe symptoms or complications present.

Correct Answer: C

Rationale: The correct action to take first when a child with sickle cell anemia presents with severe chest pain, fever, cough, and dyspnea is to notify the practitioner because acute chest syndrome is suspected. This condition is a medical emergency requiring prompt intervention. Administering oxygen or pain medication may be necessary interventions but should not precede notifying the practitioner. Stroke is not typically associated with these symptoms in sickle cell anemia.