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
[{'content': 'CHF leads to? \nSelect and explain. \nA. Hypervolemic hyponatremia with UNa < 20, B. Hypovolemic hyponatremia with UNa < 20, C. Euvolemic hyponatremia with UNa < 20, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CHF - |CO -|GFR | activate RAAS | | Aldosterone - TBW||, Salt| - Hypervolemic Hyponatremia Hypovolemic hyponatremia - Diarrhoea Euvolemic hypnonatremia Hypothyroidism, Glucocoicoid deficiency SIADH', 'role': 'assistant'}]