**Core Concept**
The Laryngeal Mask Airway (LMA) is a supraglottic airway device used for ventilation in anesthesia and emergency situations. It sits above the glottic opening, allowing for ventilation without the need for endotracheal intubation.

**Why the Correct Answer is Right**
The correct answer is **D. Does not require laryngoscope & visualisation**. The LMA does not require the use of a laryngoscope or visualization of the vocal cords to be placed, making it a simpler and more straightforward alternative to endotracheal intubation. This is because the LMA is inserted blindly into the hypopharynx, where it sits above the glottic opening.

**Why Each Wrong Option is Incorrect**
* **Option A:** More reliable than face mask. While the LMA is more reliable than a face mask in terms of providing a seal, it is not more reliable in terms of preventing aspiration.
* **Option B:** Prevent aspiration. The LMA does not prevent aspiration and can actually increase the risk of aspiration, as it sits above the glottic opening and does not provide a secure airway.
* **Option C:** Alternative to Endotracheal tube (E.T.T). While the LMA is an alternative to endotracheal intubation, it is not a true alternative, as it does not provide a secure airway and can increase the risk of aspiration.
* **Option E:** Can be used in full stomach. The LMA should not be used in a patient with a full stomach, as it can increase the risk of aspiration.

**Clinical Pearl / High-Yield Fact**
The LMA is a useful alternative to endotracheal intubation in situations where a secure airway is not immediately necessary, such as in short procedures or in patients who are difficult to intubate. However, it should not be used in patients with a full stomach or in situations where a secure airway is required.

**Correct Answer:** D. Does not require laryngoscope & visualisation