Correct Answer: A

Rationale: The correct answer is A. Cystic fibrosis is a genetic disorder that primarily affects the respiratory and digestive systems. It results in the production of thick, sticky mucus that can clog the lungs and obstruct the pancreas. This explanation is crucial for parents to understand the impact of the condition on their child's health. Choice B is incorrect because cystic fibrosis is not an autoimmune disorder. Choice C is partially correct in that cystic fibrosis is a genetic disorder, but it requires a comprehensive management approach beyond just medication. Choice D is incorrect as cystic fibrosis is not caused by prenatal exposure to toxins but rather by inheriting specific genetic mutations.

Correct Answer: C

Rationale: The correct answer is to record the best of three attempts when using a peak flow meter. This method provides a more accurate measure of peak expiratory flow. Choice A is incorrect because using the device before taking medication may not reflect the actual peak flow, as medication can affect lung function. Choice B is incorrect as using the device during asthma attacks may not be feasible or safe, as the focus during an attack should be on managing symptoms rather than measuring peak flow. Choice D is incorrect because using the device after eating may not provide an accurate measurement of peak flow, as digestion can affect lung function temporarily.

Correct Answer: A

Rationale: Preventing shivering is crucial in this situation as it can increase the body temperature and counteract the effects of antipyretic measures aimed at reducing the fever. Shivering generates heat, potentially worsening the fever. Restricting oral fluids (Choice B) is not appropriate as fluid intake is important to prevent dehydration, especially in a child who has been vomiting. Measuring output hourly (Choice C) and taking vital signs hourly (Choice D) are important nursing actions but not as critical as preventing shivering in this scenario. Therefore, the most important nursing action is to prevent shivering to aid in fever reduction and management.

Correct Answer: C

Rationale: In this scenario, the nurse should notify Child Protective Services for immediate intervention. The girl disclosed ongoing sexual abuse by her grandfather, which is a serious concern requiring immediate protection and intervention by the appropriate authorities. Child Protective Services are trained to handle cases of child abuse and neglect, ensuring the safety and well-being of the child. While notifying the police about a possible sex crime is crucial, Child Protective Services should be the first point of contact in cases of suspected child abuse due to their specialized role. Confirming the pregnancy through a healthcare provider is not the priority at this moment, as ensuring the safety of the child is paramount. Informing the girl's mother about the positive test result is not appropriate given the lack of belief in the abuse disclosure and the potential risk to the child's safety.

Correct Answer: A

Rationale: The priority nursing intervention for a child with acute lymphoblastic leukemia (ALL) receiving chemotherapy is to prevent infection. Chemotherapy compromises the child's immune system, increasing susceptibility to infections. Preventing infection is crucial to avoid potential complications such as sepsis, which can be life-threatening. Administering chemotherapy is essential for treating ALL but preventing infection takes precedence due to the increased risk of infections associated with chemotherapy-induced immunosuppression. Providing nutritional support is important for overall health but preventing infections is more critical in this context. Monitoring fluid intake is significant, but the priority is to prevent infections that can have severe consequences in an immunocompromised child.