This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of the following drug is used in this test? 
Select and explain. 
A. Tolazoline, B. Clonidine, C. Bismuth, D. Oxymetazoline
A: Tolazoline
Answer: A: Tolazoline 
Explanation: The picture shows Peripheral angiography for which we need vasodilatation. Vasodilatation is produced best by non-selective alpha-blockers, tolazoline is more selective for peripheral vesselsRef: CMDT 2010-Pg 1434