Which neurotransmitter helps regulate the "pleasure pathway"?

Question

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Dopamine is the neurotransmitter that helps regulate the "pleasure pathway" in the brain, also known as the reward circuit. It is released when we engage in pleasurable experiences such as eating or having sex, and reinforces these behaviors by creating a sense of pleasure and motivation to repeat them. Abnormal levels of dopamine have been linked to addiction and other psychiatric disorders.

Which Neurotransmitter Helps Regulate the "Pleasure Pathway