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
[{'content': "A young hypertensive patient has serum K+ 2.8 meq/L and aldosterone level with ↓ed plasma renin activity. The likely cause is/are - \nSelect and explain. \nA. Renal artery stenosis, B. Ectopic ACTH syndrome, C. Diuretic therapy, D. Conn's syndrome", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]