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 color of the eyes depends on the pigment present in: 
 Options:  <1> Pupil. <2> Cornea. <3> Iris. <4> Choroid <5> Retina.
