Final answer:
The first drug that should be administered to the patient in ventricular fibrillation is Epi 1mg (epinephrine).
Step-by-step explanation:
In this scenario, the patient is experiencing a medical emergency called ventricular fibrillation. The first drug that should be administered to this patient is Epi 1mg, option A. Epinephrine (also known as adrenaline) is commonly used in cardiac emergencies to improve blood flow to the heart and increase the chances of restoring a normal heart rhythm. It acts by constricting the blood vessels and increasing the heart's pumping action.