This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hea failure, Subject name: Medicine
CHF leads to? 
Select and explain. 
A. Hypervolemic hyponatremia with UNa < 20, B. Hypovolemic hyponatremia with UNa < 20, C. Euvolemic hyponatremia with UNa < 20, D. None of the above
A: Hypervolemic hyponatremia with UNa < 20
Answer: A: Hypervolemic hyponatremia with UNa < 20 
Explanation: CHF - |CO -|GFR | activate RAAS | | Aldosterone - TBW||, Salt| - Hypervolemic Hyponatremia Hypovolemic hyponatremia - Diarrhoea Euvolemic hypnonatremia Hypothyroidism, Glucocoicoid deficiency SIADH