Why do people drink coffee?
Coffee contains caffeine which is a stimulant.  It increases wakefulness and alertness.  Too much coffee can cause hyperactivity.
<START_INST>Why do people drink coffee?<END_INST><START_CTX><END_CTX><START_A>Coffee contains caffeine which is a stimulant.  It increases wakefulness and alertness.  Too much coffee can cause hyperactivity.<END_A>