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': "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: Ans. is 'a' Pheochromocytoma Pheochromocytoma does not cause weight gain , it causes weight lossEndocrine and metabolic causes of weight lossHyperthyroidismDiabetes MellitusPheochromocytomaAdrenal Insufficiency", 'role': 'assistant'}]