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
A young hypeensive patient has serum K+ 2.8 meq/L and Taldosterone level with Si-ed plasma rennin activity. The likely cause is: 
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: Answer is D (Conn's syndrome): Increased Aldosterone levels (Hjperaldosteronism) in the presence of hypeension hypokalemia and decreased rennin activity suggests a diagnosis of Conn's syndrome.