Task: Question Answering
Input (English): 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.
Output (English): 4