This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
drug directly acting on blood vessels is 
Select and explain. 
A. Hydralizine, B. Verapamil, C. Propranolol, D. Methyldopa
A: Hydralizine
Answer: A: Hydralizine 
Explanation: Hydralazine is used with or without other medications to treat high blood pressure. Lowering high blood pressure helps prevent strokes, hea attacks, and kidney problems.Hydralazine is called a vasodilator. It works by relaxing blood vessels so blood can flow through the body more easily. Refer kDT 6/e p547