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: Medicine
[{'content': "Weight gain is seen in all of the following except: March 2009 \nSelect and explain. \nA. Phaeochromocytoma, B. Hypothyroidism, C. Insulinoma, D. Cushing's syndrome", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A: Phaeochromocytoma Medical causes of weight gain: Olanzapine Ethinylestradiol Trifluperidol Orchidectomy Pizotifen Hypothyroidism Clozapine Mianserin Cyproterone Haloperidol Cushing's syndrome Insulinfinsulinoma Prednisolone Testosterone Growth hormone secreting pituitary tumour Phaeochromocytoma is associated with weight loss.", 'role': 'assistant'}]