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 statements about hydralazine is not true ? 
Select and explain. 
A. It causes direct relaxation of the blood vessels, B. It causes dilatation of both arteries and veins, C. Postural hypotension is not a common problem, D. It increases plasma renin activity
B: It causes dilatation of both arteries and veins
Answer: B: It causes dilatation of both arteries and veins 
Explanation: None