You may be surprised at how much you know. Caffeine is a stimulant. As a stimulant, caffeine in excess can have many side effects. In moderation, caffeine is a mild stimulant that increases urination and the heart rate and rhythm.
Excessive intake can cause restlessness, insomnia, heart irregularities, and delirium.
Decaffeinated coffee and teas have no caffeine. False is the right answer here. Even though it seems as these drinks should have no caffeine, most contain at least a small amount. This is due to the difficult process required to produce decaffeinated drinks. Usually the small amount present in any of these items will not cause any side effects.