This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
[{'content': 'Which of the following conditions is characterized by episodes of excessive and uncontrolled eating: \nSelect and explain. \nA. Anorexia nervosa, B. Bulimia nervosa, C. Body dysmorphophobia, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B ref: Ahuja, 4th/e p. 136-137 and 5th/ep. 151', 'role': 'assistant'}]