Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The pulmonary surfactant: 
 Options:  <1> It is secreted by type I pneumocytes. <2> Stabilizes the alveoli. <3> Its main component is albumin. <4> Increases the surface tension of the alveolus. <5> It is only in the small alveoli.
