Correct Answer: B

Rationale: The most appropriate type of play for a hospitalized toddler is parallel play. This type of play allows toddlers to engage alongside each other but not directly with each other, which can be comforting and less overwhelming in a hospital setting. Cooperative play (choice A) involves working together towards a common goal, which may be challenging for a hospitalized toddler. Competitive play (choice C) involves a level of rivalry that may not be suitable during a hospital stay. Solitary play (choice D) involves playing alone, which may not provide the social interaction and distraction that parallel play can offer in a hospital environment.

Correct Answer: B

Rationale: The correct answer is B: Encourage oral rehydration. Oral rehydration is the first-line treatment for moderate dehydration in children. It helps restore fluid balance and electrolyte levels. Administering IV fluids (Choice A) is usually reserved for severe cases of dehydration where oral rehydration is not feasible or ineffective. Monitoring vital signs (Choice C) is important but should not replace the immediate need for rehydration. Providing clear fluids (Choice D) may not contain the necessary electrolytes required for effective rehydration.

Correct Answer: B

Rationale: The correct answer is B: Hypertrophic pyloric stenosis. The "string sign" is associated with hypertrophic pyloric stenosis, a condition where the pyloric canal is narrowed, leading to gastric outlet obstruction. Intussusception (choice A) typically presents with colicky abdominal pain and currant jelly stools. Hirschsprung disease (choice C) is characterized by the absence of ganglion cells in the distal colon. Meckel diverticulum (choice D) is a congenital outpouching of the small intestine that can present with painless rectal bleeding.

Correct Answer: B

Rationale: The correct answer is B: All are applicable. Ice, raw vegetables, and unpeeled fruits can be sources of contamination in areas where water purity is questionable. It's safer to avoid these during a mission trip to prevent waterborne illnesses. Choice A (Ice), C (Raw vegetables), and D (Unpeeled fruits) are all potential sources of contamination in areas with questionable water quality. Including all these items in the teaching will help adolescents make informed decisions to stay healthy during their mission trip.

Correct Answer: A

Rationale: Polyarthritis is indeed frequently the initial sign of acute rheumatic fever in children. It presents as joint pain, swelling, and redness. Carditis (inflammation of the heart), Erythema marginatum (a skin rash), and Sydenham chorea (involuntary muscle movements) are typically seen in the later stages of acute rheumatic fever and not as the initial sign.