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
[{'content': 'The drug used in coronary aery stenosis during Angio procedure? \nSelect and explain. \nA. Pindolol, B. Octreotide, C. Desmopressin, D. Tolazoline', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]