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. Phaeochromocytoma, B. Insulinoma, C. Myxoedema, D. Cushing's disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]