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: Indicate which of the following compounds is a fibrous protein: 
 Options:  <1> Chymotrypsin <2> Cytochrome c. <3> Alpha-keratin <4> Lysozyme <5> Ribonuclease.
