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 hormone that facilitates the reabsorption of water by the kidneys, whose absence causes loss of large amounts of water in the urine, is called: 
 Options:  <1> Oxytocin <2> Vasopressin <3> Dopamine <4> Cholecystokinin <5> Glutamate.
