The alkaloid caffeine is present in

The correct answer is (c). Caffeine is a naturally occurring stimulant found in tea leaves, coffee beans, and cocoa beans. It is also added to some soft drinks, energy drinks, and over-the-counter medications. Caffeine is absorbed quickly from the stomach and small intestine and reaches peak levels in the blood within 30 to 60 minutes. It is then metabolized by the liver and excreted in the urine. Caffeine has a half-life of about 5 hours, meaning that it takes about 5 hours for the body to eliminate half of the caffeine that has been consumed.

Caffeine is a central nervous system stimulant that increases alertness, attention, and energy levels. It can also improve

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