You are on the scene of a 64-year-old male with substernal chest pain. His vital signs are blood pressure 90/70, pulse 80, respiratory rate 20, and oxygen saturation 95 percent on room air. He has a history of angina pectoris and high cholesterol. The patient is not allergic to any medications. What medications should you administer?
A) Oxygen and aspirin
B) No medications
C) Oxygen, nitroglycerin, and aspirin
D) Oxygen