This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
A young hypeensive patient has serum K+ 2.8 meq/L and aldosterone level with increased plasma rennin activity. The likely cause is/are - 
Select and explain. 
A. Renal aery stenosis, B. Ectopic ACTH syndrome, C. Diuretic therapy, D. Conn's syndrome
D: Conn's syndrome
Answer: D: Conn's syndrome 
Explanation: Conn&;s syndrome involves increased aldosterone , hypeension , hypokalemia, low plasma renin activity ( Harrison 17 pg 2260)