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
The drug used in coronary aery stenosis during Angio procedure? 
Select and explain. 
A. Pindolol, B. Octreotide, C. Desmopressin, D. Tolazoline
D: Tolazoline
Answer: D: Tolazoline 
Explanation: Talazoline is used as a vasodilator for angio proccedures. Non-selective alpha blockers like phentolamine and tolazoline are used for this purpose. Ref: CMDT-2010/Pg 1434.