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
[{'content': 'Most common cause of cushings syndrome is \nSelect and explain. \nA. Pituitary adenoma, B. Adrenal adenoma, C. Ectopic ACTH, D. Iatrogenic steroids', 'role': 'user'}, {'content': "Answer: D \nExplanation: Most common cause of Cushing's syndrome is prolonged administration of glucocorticoid harmones.", 'role': 'assistant'}]