Correct Answer: A

Rationale: Itching is typically the primary and most common symptom of pediculosis capitis due to the lice bites on the scalp.

Correct Answer: B

Rationale: Adolescents often seek guidance and support from their peers. Setting up a meeting with older teens who are effectively managing chronic renal failure can provide the 14-year-old with motivation, encouragement, and practical advice on how to handle their treatment regimen. This peer support can positively influence the non-compliant adolescent, making choice B the most likely intervention to improve compliance. Choices A and C may not address the peer influence aspect of adolescent behavior, while choice D focuses on punitive measures rather than addressing the underlying reasons for non-compliance.

Correct Answer: C

Rationale: A frozen teething ring is effective for relieving teething pain as the cold helps numb the gums and reduce inflammation, making it a safe and effective method for managing discomfort

Correct Answer: B

Rationale: The correct answer is B. Acquired aplastic anemia in children is often caused by exposure to certain drugs, such as chloramphenicol or antiepileptics, which can lead to bone marrow failure and a decrease in all types of blood cells. Choices A, C, and D are incorrect because aplastic anemia is not commonly caused by deficient diet, congenital defects, or injury in children.

Correct Answer: A

Rationale: Varicella (chickenpox) is an airborne infectious disease, requiring isolation to prevent the spread of the virus.