Instructions: 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: Along with Behavioral Cognitive Therapy, what other therapeutic approach has consistently shown to be an effective treatment for bulimia nervosa ?: 
 Options:  <1> Interpersonal psychotherapy <2> Mentalization therapy <3> The exposure therapy in imagination. <4> The economy of chips. <5> The therapy of schemes.
Output:
1