This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Which of the following indications for hospitalization is the most appropriate for patients with eating disorders? \nSelect and explain. \nA. when body weight is less than 90% of expected, B. when body weight is less than 75% of expected, C. when electrolyte disturbances occur, D. when body weight is less than 60% of expected', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hospitalization should be considered when the body weight dips below 75% of the expected. The goal is to achieve a weight of 90% of that expected. Vomiting is more characteristic of bulimia than anorexia nervosa (AN).', 'role': 'assistant'}]