This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluids and Electrolyte Imbalance, Subject name: Medicine
All are used for management for hypernatremia except? 
Select and explain. 
A. 5% dextrose in water, B. N/2 in 5% dextrose, C. Nil by mouth, D. Indomethacin
C: Nil by mouth
Answer: C: Nil by mouth 
Explanation: Hypernatremia is treated with free water intake by month or NG tube if patient is not obtunded. Dilute hypotonic fluids like 5% dextrose in water and N/2 in 5% water are given to decrease serum sodium at a rate of 0.3 mmol/Hr. Drug that stimulate vasopressin like chlorpropamide / indomethacin / carbamazepine and clofibrate will also increase water absorption from collecting duct and reduce serum sodium.