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
All are true regarding SIADH except: 
Select and explain. 
A. Increased level of ADH, B. Urine hypoosmolar, C. Hyponatremia, D. Adequate hydration status
B: Urine hypoosmolar
Answer: B: Urine hypoosmolar 
Explanation: Answer is B (Hyposmolar urine): SIADH is characterized by an inappropriately increased urine osmolality (Hyperosmolar urine) in the presence of decreased plasma osmolality.