Task: Question Answering
Input (English): Question: In what disorder of eating behavior, the personality of patients is characterized as impulsive people, with a tendency to make quick decisions and act unpredictably? 
 Options:  <1> Anorexia nervosa of restrictive type. <2> Pica. <3> Obesity. <4> Bulimia nervosa. <5> Night dining
Output (English): 4