Task: Text Categorization
Input (English): Question: The obturator or catheter in a tracheostomy cannula serves to: 
 Options:  <0> Introduce the external cannula into the tracheal stoma in a non traumatic way. <1> Aspirate secretions if a vacuum source is directly connected. <2> Help maintain the permeability of the artificial airway. <3> Fix the cannula avoiding its accidental displacement. <4> Allow the patient to speak by allowing the air to pass through the vocal cords.
Output (English): nursery