This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Airway, Subject name: Anaesthesia
Which of the following is not a definitive airway device- 
Select and explain. 
A. Orotracheal Intubation, B. Nasotracheal intubation, C. LMA, D. Tracheostomy
C: LMA
Answer: C: LMA 
Explanation: LMA is temporary airway device since it cannot prevent aspiration. The Laryngeal Mask Airway LMA is asupraglottic airway devicewhich sits in the hypopharynx and paially protects thelarynx from pharyngeal secretions, but not gastric regurgitation. Advantages: Easy and rapid Less invasive Better hemodynamic stability Very useful in difficult intubations Less complications Does not require deep plane of anaesthesia