This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Sodium and Potassium, Subject name: Pediatrics
Which is not a feature of SIADH? 
Select and explain. 
A. Euvolemia, B. Urine Osmolality > 100 mosm/ kg, C. Low urine sodium, D. Treatment is fluid restriction
C: Low urine sodium
Answer: C: Low urine sodium 
Explanation: SIADH - Syndrome of inappropriate ADH secretion: * Euvolemia * Urine osmolality > 100 mosm/kg * High urine sodium (>20-30 meq/L) * Treatment is water restriction.