Final answer:
γ-Aminobutyric acid (GABA) is the inhibitory neurotransmitter in the central nervous system (CNS).
Step-by-step explanation:
The inhibitory neurotransmitter in the central nervous system (CNS) is γ-Aminobutyric acid (GABA). GABA is synthesized by the enzyme glutamic acid decarboxylase (GAD) from glutamate. GABA functions by causing hyperpolarization, inhibiting the firing of neurons.
Glycine is also an inhibitory neurotransmitter, while norepinephrine, glutamate, serotonin, and histamine are not inhibitory neurotransmitters in the CNS.