Which of the following items is contained in the demo equipment?

The correct answer is the oxygen mask, as it is typically included in demo equipment for training purposes. Oxygen masks are essential tools used in emergency situations to provide supplemental oxygen to individuals who may be experiencing difficulty breathing, such as in cases of smoke inhalation or other respiratory emergencies. Training with these masks helps responders become familiar with their operation, ensuring they can administer first aid effectively during real emergencies.

In contrast, the other items listed serve different roles. Inflatable life vests are commonly used for personal flotation and safety during water activities, while fire extinguishers are critical for managing small fires but are not usually part of standard demo equipment in training sessions. Defibrillators are vital for cardiac emergencies but are typically included in medical training rather than basic emergency response kits. Each of these tools serves important functions, but the oxygen mask is specifically relevant for immediate respiratory support in emergencies, making it a key component of demo equipment.