Final answer:
Nitroglycerin is the vasodilator most commonly used to relieve angina pain, due to its ability to release nitric oxide and relax coronary vessels.
Step-by-step explanation:
The vasodilator most commonly used to ease the pain of angina is nitroglycerin. Nitroglycerin works by releasing nitric oxide, which is a known vasodilator that relaxes the smooth muscle in the tunica media of coronary vessels, thereby improving blood flow and reducing chest pain-angina symptoms. While aspirin is used to help break up clots and other medications like beta blockers or calcium channel blockers are used to manage cardiac symptoms over the longer term, nitroglycerin is specifically indicated for providing immediate relief in cases of angina pectoris.