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: Pharmacology
Which of the following is true regarding enalapril treatment in patients of essential hypertension? 
Select and explain. 
A. Decreased angiotensin II concentration in the blood, B. Decreased concentration of renin in the blood, C. Decreases sodium and increases potassium in the urine, D. All of the above
A: Decreased angiotensin II concentration in the blood
Answer: A: Decreased angiotensin II concentration in the blood 
Explanation: None