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: Pediatrics
Hyperkalemia in children may occur in all except – 
Select and explain. 
A. Insulin deficiency, B. Metabolic acidosis, C. Acute renal failure, D. Cushing's syndrome
D: Cushing's syndrome
Answer: D: Cushing's syndrome 
Explanation: Hyperkalemia
Hyperkalemia defined as serum K+ concentration > 5.5 meq/L.