Q: Fact 1: Caffeine is a central nervous system stimulant. Fact 2: Cocaine is a stimulant and increases the user's heart rate and blood pressure. Given the two facts above, what does caffeine do?

Options:
i. Increase fame.
ii. increases a body's strength.
iii. Release energy.
iv. Increase user's heart rate.
v. Transfers energy.
vi. decrease stamina.
vii. Increase intelligence.
viii. Increase wealth.
The answer is:
iv.