Task: Text Categorization
Input (English): Question: In relation to pulmonary surfactant, indicate the correct answer: 
 Options:  <0> It contains enzymes necessary for gas exchange. <1> It helps to eliminate harmful elements in the alveoli. <2> It is secreted by type 1 pneumonites. <3> Decreases alveolar surface tension. <4> It is only synthesized in emergency situations.
Output (English): nursery