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 except: \nSelect and explain. \nA. Cushings syndrome, B. Hypothyroidism, C. Pheochromocytoma, D. Insulinoma', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer is C (Pheochromocytoma): Pheochronsocytoma is associated with weight loss. Cushing's syndrome, Hypothyroidism and Insulinoma are all associated with weight gain", 'role': 'assistant'}]