Correct Answer: D
Solution :Neurotransmitters are chemicals that are used to relay, amplify and modulate electrical signals between a neuron and another cell. Substances that act as neurotransmitters can be categorized into three major groups (1) amino acids (primarily glutamic acid, GABA, aspartic acid & glycine), (2) peptides etc.) and (3) monoamines (norephinephrine, dopamine and serotonin) plus acetylcholine.
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