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
Which of the following statements is true about SIADH: 
Select and explain. 
A. Hypovolemic Hyponatremia, B. Euvolemic Hyponatremia, C. Hypervolemic Hyponatremia, D. Hypervolemic Hypernatremia
B: Euvolemic Hyponatremia
Answer: B: Euvolemic Hyponatremia 
Explanation: Answer is B (Euvolemic Hyponatremia): SIADH is characterized by Euvolemic Hyponatremia.