Correct Answer: A

Rationale: The correct answer is Varicella (chickenpox), choice A. Varicella can lead to the complication of encephalitis, which is the inflammation of the brain. Scarlet fever (choice B) is caused by Group A Streptococcus bacteria and does not typically lead to encephalitis. Poliomyelitis (choice C) is a viral infection that affects the nervous system but does not directly cause encephalitis. Whooping cough (choice D), also known as pertussis, primarily affects the respiratory system and does not commonly result in encephalitis.

Correct Answer: A

Rationale: The correct intervention for a sprained ankle is to apply ice for 20 minutes every hour for the first 24 hours, then remove for 60 minutes to prevent tissue damage. This regimen helps reduce swelling and pain. Bed rest with the leg elevated for an extended period (36 hours) may lead to stiffness and decreased range of motion. While NSAIDs can be used for pain, they may not be necessary if pain is manageable with ice and rest. Using a compression dressing for 72 hours continuously may impede proper circulation and delay healing by restricting blood flow.

Correct Answer: A

Rationale: The correct answer is A: 'It is a condition affecting the respiratory and digestive systems.' Cystic fibrosis is a genetic disorder that primarily affects the respiratory and digestive systems. It is caused by a defective gene that leads to the production of thick and sticky mucus in these organs. This mucus can clog airways in the lungs and block the ducts in the pancreas, affecting digestion. Choice B is incorrect because cystic fibrosis is not an autoimmune disorder; it is a genetic condition. Choice C is partially correct in that cystic fibrosis is a genetic disorder, but merely managing it with medication oversimplifies the comprehensive care needed for individuals with cystic fibrosis. Choice D is incorrect as cystic fibrosis is not caused by prenatal exposure to toxins but is a genetic condition inherited from parents.

Correct Answer: C

Rationale: Longer periods of sleep than usual can be a sign of illness in infants. When an infant sleeps more than usual, it may indicate that the baby is conserving energy due to an underlying condition. Grunting respirations (choice A) can be a sign of respiratory distress, excessive perspiration (choice B) may indicate overheating or fever, and crying immediately after feedings (choice D) can be a sign of gastrointestinal discomfort, such as colic or reflux. However, in this scenario, the emphasis is on changes in sleep patterns as a potential indicator of illness.

Correct Answer: D

Rationale: Asking the parents if they smoke in the home is the most relevant question as exposure to secondhand smoke can exacerbate respiratory symptoms like wheezing and difficulty breathing in children. This information is crucial for identifying potential triggers for the child's symptoms. Inquiring about child safety in the home, asking about the child's temperament, and inquiring about the child's diet, while important aspects of care, may not directly address the respiratory symptoms the child is experiencing.