Question

what is the third link in the adult out - of - hospital chain of survival?
prevention
high - quality cpr
defibrillation
advanced life support

Explanation:

The adult out - of - hospital Chain of Survival has several links. The first link is recognition of cardiac arrest and activation of the emergency response system. The second is early cardiopulmonary resuscitation (CPR). The third is rapid defibrillation. High - quality CPR is the second link. Prevention is part of the in - hospital Chain of Survival in some models but not the third out - of - hospital link. Advanced life support is a later link.

Answer:

Defibrillation