A 45-year-old unconscious patient requires airway management in the emergency room. An Laryngeal Mask Airway (LMA) is inserted. What is its main purpose?

Correct option is B

LMA is a supraglottic device used to maintain airway patency in unconscious patients where intubation is difficult. It does not protect fully against aspiration.
Explanation of options: (a) ✘ Endotracheal tube, not LMA, gives definitive airway protection. (b) ✔ Correct; LMA maintains airway in unconscious when ET tube not possible. (c) ✘ Cricothyroidotomy is invasive surgical airway, not LMA. (d) ✘ Selective lung ventilation requires double-lumen ET tube.