Detailed 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'.
Problem:Question: Woman, 63 years old, in treatment for bone cancer. He has intense pains so he uses morphine daily. Faced with complaints of constipation, it is proposed as a laxative of choice:
Options: <1> Methylcellulose <2> Glycerin. <3> Loperamide. <4> Methylnaltrexone <5> Racecadotril.
Solution:
4