Examlex
Which of the following comes closest to providing pure service?
Amphetamine
A stimulant that affects the central nervous system, commonly used to treat ADHD and narcolepsy.
Dopamine
A neurotransmitter important in reward, motivation, and motor control, often linked to pleasure and addiction.
Neurotransmitter
Chemical substances that transmit signals across a synapse from one neuron to another neuron or to a target cell.
Amphetamine
A potent central nervous system stimulant that is used in the treatment of attention deficit hyperactivity disorder (ADHD), narcolepsy, and for weight loss, but can also be abused as a recreational drug.
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