This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eating Disorders, Subject name: Psychiatry
Which of the following is not a common feature of anorexia nervosa? 
Select and explain. 
A. Binge eating, B. Amenorrhea, C. Self - perception of being fat, D. Under weight
A: Binge eating
Answer: A: Binge eating 
Explanation: All the four options are features of anorexia nervosa. However, if one has to chose, the best answer would be binge eating. Though binge eating is seen in almost 50% of patients with anorexia nervosa, however its not a core symptom of anorexia nervosa. Amenorrhea has been removed as a diagnostic criterion in DSM-5, however, studies have shown that around 68% to 89% of females with anorexia nervosa have amenorrhea for at least 3 months