Instructions: 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: Which of the following actions is NOT specific to prolactin?
Options: <1> It favors the renal retention of water and salt. <2> It favors the corpus luteum. <3> Stimulates milk production <4> Stimulates the hypothalamic secretion of the gonadotrophin releasing hormone. <5> Participates in the control of spermatogenesis.
Output:
4