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 islets of Langerhans of the pancreas secrete and release: 
 Options:  <1> Cholecystokinin <2> Insulin and glucagon. <3> Vasopressin <4> Adrenaline and noradrenaline. <5> Prolactin
