A(n) ___________ can be used as a substitute for the EOSC at a category 1 facility.

• A. bulk oxygen source
• B. main line valve
• C. in-building emergency reserve
• D. emergency plan

Answer: (C)

The idea being tested is having a backup oxygen source ready on site to keep care going if the normal supply drops. An Emergency Oxygen Storage Cabinet (EOSC) is a dedicated backup source, but when that specific option isn’t available, an in-building emergency reserve can serve as the substitute. This reserve is an on-site stock of oxygen that can be connected quickly to the system to bridge the gap during an outage, meeting the need for an immediate, reliable backup within the building. The other options don’t provide a physical, ready-to-use backup supply: a bulk oxygen source is part of the primary system, a main line valve is a control point rather than a supply, and an emergency plan is procedural, not a source of oxygen.