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: One of the main limitations of the behavioral treatment (exposure with prevention of response) of OCD is: 
 Options:  <1> His recent appearance. <2> The reduced efficacy compared to cognitive and pharmacological treatments. <3> The lack of an explanatory theoretical model. <4> The difficulty of application in cases of motor rituals. <5> The existence of a relevant percentage of patients who reject treatment because of its aversive nature.
