This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Electrolyte Imbalance, Subject name: Medicine
Leading cause of hyperkalemia is? 
Select and explain. 
A. Redistribution of potassium, B. Reduced excretion kidney, C. Adrenal neurohormonal surge, D. Drugs
B: Reduced excretion kidney
Answer: B: Reduced excretion kidney 
Explanation: Kidney diseases are leading cause of Hyperkalemia