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
What is the cause of hyperkalemia in chronic kidney failure 
Select and explain. 
A. Release from cells, B. Hyperinsulinemia, C. Decreased excretion, D. Hyperaldosteronism
C: Decreased excretion
Answer: C: Decreased excretion 
Explanation: Answer- C. Decreased excretion