This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Appetite is decreased by following, except: \nSelect and explain. \nA. Methylphenidate, B. Olanzapine, C. Fluoxetine, D. Seraline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Olanzapine', 'role': 'assistant'}]