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Q All of the following are examples of definitive airways except
A. Nasotracheal tube
B. Orotracheal tube
C. Laryngeal mask airway
D. Cricothyroidotomy

Explanation
Definitive airways :
Prevents aspiration of gastric contents , allows for control of ventilation and permits delivery of higher concentration of oxygen.
Includes endotracheal tube, tracheostomy and cricothyroidotomy.

Non definitive airways
They donnot protect the patients from gastric aspiration.
The concentration of oxygen delivered to the patient is lower.
But they have the advantage of being easier to insert.
Eg. Laryngeal mask airway, oropharyngeal airway, nasopharyngeal airway