This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Name the drug used for this procedure 
Select and explain. 
A. Metoprolol, B. Atenolol, C. Phenoxybenzamine, D. Tolazoline
D: Tolazoline
Answer: D: Tolazoline 
Explanation: Tolazoline is an alpha blocker used in peripheral aeriography as it produces vasodilatation and has more selective action on peripheral vessels. Refr: KD Tripathi 8th ed.