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 corpuscles of Pacini: 
 Options:  <1> They are innervated by unmyelinated fibers. <2> They are mechanoreceptors of slow adaptation. <3> They have small receptor fields. <4> They are located in deep areas of the dermis. <5> They are thermoreceptors.
