A patient admitted to the emergency room is having angina)type chest pains. An ECG is ordered and it shows inverted T waves. The patient is receiving oxygen at 100% via nonrebreathing mask. Which of the following medication would be most helpful to the patient?
A. Nitrogycerin (Isordil)
B. Crystodigin (digitalis)
C. Sodium chloride
D. Potassium chloride