**Core Concept**
Neonatal resuscitation relies on effective ventilation to ensure adequate oxygenation and gas exchange. The choice of ventilation device and its configuration significantly impacts oxygen delivery and patient safety, particularly in newborns with compromised respiratory function.

**Why the Correct Answer is Right**
A self-inflating bag (SIB) must be used with a reservoir bag to deliver controlled, intermittent positive pressure ventilation (IPPV). Without a reservoir, the flow is uncontrolled and results in high peak pressures and free flow oxygen, which can cause airway injury and ineffective ventilation. The reservoir acts as a volume reservoir, allowing precise delivery of oxygen at controlled pressure. Therefore, using a SIB without a reservoir is contraindicated in neonatal resuscitation.

**Why Each Wrong Option is Incorrect**
Option A: T-tube delivers free flow oxygen — This is true; T-tubes are designed for free flow oxygen delivery, commonly used in neonatal resuscitation for continuous oxygen supply.
Option C: Self-inflating bag can deliver free flow oxygen — This is misleading; while a SIB *can* deliver free flow oxygen, it is unsafe and inappropriate without a reservoir. The statement is technically true in form but clinically misleading, making it a distractor.
Option D: Flow-inflating bag delivers free flow oxygen — Flow-inflating bags (e.g., flow-inflating resuscitation bags) are designed to deliver free flow oxygen, especially in emergency settings. This is accurate and thus correct in principle.

**Clinical Pearl / High-Yield Fact**
Always use a reservoir bag with a self-inflating bag during neonatal resuscitation. Without it, you risk barotrauma and ineffective ventilation. Never rely on free flow oxygen for ventilation in a newborn — it lacks control and is unsafe.

✓ Correct Answer: B. Self - inflating bag should not be used without reservoir