During basic life support of a 10-year-old child:

Correct Answer: D

Rationale: The encircling technique provides effective chest compressions in infants and children. It involves using both thumbs while the hands encircle the chest, ensuring better compression depth and recoil.

Correct Answer: A

Rationale: Breath-holding spells are often linked to iron deficiency anemia and typically resolve by age 5. They are not seizures or solely expressed as tonic movements.

Correct Answer: A

Rationale: ACE inhibitors reduce afterload by dilating blood vessels, improving cardiac output, and reducing the heart's workload.

Correct Answer: C

Rationale: Epstein-Barr virus and other infections can cause non-IgE-mediated urticaria through immune complex formation and cytokine release.

Correct Answer: B

Rationale: Testicular enlargement is the first sign of male puberty, usually starting between ages 9-14, with an average onset around 9.5 years.