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. Smoking indoors can worsen the child's condition and is crucial information for the healthcare provider to assess and address. Inquiring about child safety in the home, asking about the child's temperament, and questioning the child's diet are important aspects of care but are not directly linked to the immediate respiratory symptoms the child is experiencing.

Correct Answer: B

Rationale: Burns on the lips and singed nasal hairs indicate inhalation injury, suggesting the child has inhaled hot gases or smoke. This presentation is common in cases where the respiratory tract is exposed to hot gases or smoke, leading to potential airway compromise. Choice A, chemical burn, is incorrect because there is no mention of exposure to chemicals, and the symptoms described are more indicative of inhalation injury. Choice C, electrical burn, is incorrect as there is no evidence of electrical involvement in the scenario provided. Choice D, hot-water scald, is incorrect because the presence of singed nasal hairs points more towards inhalation injury than a scald from hot water, emphasizing the need to prioritize airway management and respiratory support.

Correct Answer: B

Rationale: Monitoring the intravenous drop rate is crucial when administering IV fluids to ensure that the correct amount of fluids is delivered to the dehydrated infant. Choice A assumes the initial rate is correct without ongoing assessment. Choice C, while important, does not address the immediate need for monitoring the infusion rate. Choice D, maintaining the fluid at body temperature, is essential for comfort but is not as critical as ensuring the correct fluid delivery rate. By monitoring the intravenous drop rate, healthcare providers can adjust the flow as needed to prevent overhydration or underhydration, helping to manage the infant's fluid balance effectively.

Correct Answer: D

Rationale: When caring for a child with acute laryngotracheobronchitis, the priority action should be to continually assess the respiratory status. This is crucial to detect early signs of respiratory distress, such as worsening stridor or increased work of breathing. Prompt intervention can prevent further deterioration of the child's condition. Initiating measures to reduce fever (Choice A) may be necessary but is not the priority in this situation. Ensuring delivery of humidified oxygen (Choice B) is important for maintaining oxygenation but should follow the assessment of respiratory status. Providing support to reduce apprehension (Choice C) is also important for the child's comfort but is not the priority over assessing and managing respiratory distress.

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.