What is the primary mechanism of action of caffeine?
a. Serotonin reuptake inhibition
b. Acetylcholine agonist
c. Norepinephrine agonism
d. Adenosine antagonism
e. Dopamine agonism
a. Serotonin reuptake inhibition
b. Acetylcholine agonist
c. Norepinephrine agonism
d. Adenosine antagonism
e. Dopamine agonism