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 microvilli contain a beam of: 
 Options:  <1> Microtubules <2> Actin filaments. <3> Intermediate filaments <4> Spectrine <5> Collagen fibers.
