Task: Question Answering
Input (English): Question: In the first stage of Fairburn's behavioral cognitive treatment for bulimia nervosa, one of the objectives is: 
 Options:  <1> Modify maladaptive social interaction patterns. <2> Establish effective communication patterns. <3> Work on the suppression of diet follow-up. <4> Modify adaptive family functioning patterns. <5> Present the model that explains the maintenance of the problem.
Output (English): 5