Which neurotransmitter helps regulate the "pleasure pathway"?

Question

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Dopamine is the neurotransmitter that regulates the "pleasure pathway" in the brain. This pathway is responsible for sensations of pleasure, reward, and motivation. Drugs of abuse such as cocaine and methamphetamine increase dopamine levels in the brain, which can lead to addiction. Parkinson's disease, which is characterized by a loss of dopamine-producing neurons, is also related to a disruption of the pleasure pathway.

Which Neurotransmitter Helps Regulate the "Pleasure Pathway