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': 'Which drug is not used in SIADH - \nSelect and explain. \nA. Fludrocoisone, B. Demeclocycline, C. Desmopressin, D. Hypeonic saline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: demeclocycline inhibit vasopression action in renal distal tubule.severe hyponatremia require treatment with hypeonic saline and fludrocoisone ( Harrison 17 pg 620)', 'role': 'assistant'}]