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: What is the mechanism of action of octreotide ?:
Options: <1> Serotonergic receptor 5-HT4 agonist. <2> Motilin receptor agonist. <3> Somatostatin receptor agonist. <4> Antagonist of the motilin receptor. <5> Somatostatin receptor antagonist.
Output:
3