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
Most common cause of cushings syndrome is 
Select and explain. 
A. Pituitary adenoma, B. Adrenal adenoma, C. Ectopic ACTH, D. Iatrogenic steroids
D: Iatrogenic steroids
Answer: D: Iatrogenic steroids 
Explanation: Most common cause of Cushing's syndrome is prolonged administration of glucocorticoid harmones.