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: Tamoxifen: 
 Options:  <1> It is used for the treatment of type 2 diabetes. <2> It is an inhibitor of phosphoenolpyruvate carboxykinase. <3> It is a progesterone receptor agonist. <4> It is an estrogen receptor antagonist. <5> Decreases cellular sensitivity to insulin.
